Chapter 3 Quiz 1 (2nd Secondary Biology)

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  • 1/63 Questions

    The figure below is of a cell with one mitochondrion. Where does each of the following reaction occur inside the cell?Production of pyruvic acid / Oxidation of pyruvic acid / Transfer of electrons from electron donors to electron acceptors.

    • Production of pyruvate in (1) / Oxidation of pyruvate in (2) / Transfer of electrons in (3)
    • Production of pyruvate in (3) / Oxidation of pyruvate in (2) / Transfer of electrons in (4)
    • Production of pyruvate in (2) / Oxidation of pyruvate in (1) / Transfer of electrons in (4)
    • Production of pyruvate in (1) / Oxidation of pyruvate in (4) / Transfer of electrons in (3)
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About This Quiz

How much do you know about secondary biology? Biology can be defined as living organisms' study, where they come from, their anatomy, morphology, composition, behavior, and movement. Some examples of different types of biology include human biology, marine biology, and molecular biology. Biology is a natural science. This quiz can be helpful if you are studying for a biology test See moreor exam.

Chapter 3 Quiz 1 (2nd Secondary Biology) - Quiz

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  • 2. 

    Which of the following correctly explain the function a mitochondrion?

    • A 

    • B 

    • C

    • D

    Correct Answer
    A. A 
  • 3. 
    The equation in the figure below is called .... - ProProfs

    The equation in the figure below is called ....

    • Oxidative phosphorylation

    • Oxidative decarboxylation

    • Pyruvate production

    • Pyruvate reduction

    Correct Answer
    A. Oxidative decarboxylation
    Explanation
    The equation in the figure below is called oxidative decarboxylation. This process involves the removal of a carboxyl group from a molecule, typically in the form of carbon dioxide, while also generating energy through the transfer of electrons to the electron transport chain. Oxidative decarboxylation is an important step in cellular respiration, specifically in the conversion of pyruvate to acetyl-CoA, which then enters the citric acid cycle.

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  • 4. 

    Oxygen is needed in the Electron Transport System to……..

    • Prevent a pile-up (accumulation) of hydrogen ions

    • Prevent a pile-up of NAD+

    • Act as a final electron acceptor that helps to move electrons down a chain for the production of ATP

    • Oxidize glucose molecules

    Correct Answer
    A. Act as a final electron acceptor that helps to move electrons down a chain for the production of ATP
    Explanation
    Oxygen is needed in the Electron Transport System to act as a final electron acceptor that helps to move electrons down a chain for the production of ATP. In the Electron Transport System, electrons are passed from one molecule to another, creating a flow of electrons. Oxygen accepts these electrons at the end of the chain, allowing for the production of ATP, which is the energy currency of the cell. Without oxygen as the final electron acceptor, the electron transport chain would not be able to function properly, leading to a decrease in ATP production.

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  • 5. 

    Each NADH entering the Electron Transport System from Krebs cycle produces…..

    • 1 ATP

    • 2 ATP

    • 3 ATP

    • ATP

    Correct Answer
    A. 3 ATP
    Explanation
    Each NADH molecule entering the Electron Transport System from the Krebs cycle produces 3 ATP molecules. This is because during oxidative phosphorylation, NADH donates its electrons to the electron transport chain, which leads to the generation of a proton gradient across the inner mitochondrial membrane. This gradient drives the synthesis of ATP by ATP synthase, and each NADH molecule contributes enough energy to produce 3 ATP molecules. Therefore, the correct answer is 3 ATP.

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  • 6. 

    Each FADH2 entering the Electron Transport system from Kreb's cycle produces…..

    • 1 ATP

    • 2 ATP

    • 3 ATP

    • 4 ATP

    Correct Answer
    A. 2 ATP
    Explanation
    Each FADH2 molecule produced in the Kreb's cycle enters the Electron Transport System and donates its electrons to the electron transport chain. As the electrons are passed along the chain, energy is released and used to pump protons across the inner mitochondrial membrane, creating a proton gradient. This gradient is then used by ATP synthase to produce ATP. However, FADH2 enters the electron transport chain at a later stage than NADH, resulting in fewer protons being pumped and ultimately leading to the production of only 2 ATP molecules per FADH2.

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  • 7. 

    Which of the following molecules will diffuse out of the cell, enter the bloodstream, and be released from the lungs during aerobic cellular respiration?

    • Oxygen

    • Carbon dioxide

    • ATP

    • Glucose

    Correct Answer
    A. Carbon dioxide
    Explanation
    During aerobic cellular respiration, glucose is broken down in the cell to produce ATP and carbon dioxide as waste. Oxygen is taken in by the cell to aid in the production of ATP. While ATP is used as an energy source within the cell, it does not diffuse out of the cell or enter the bloodstream. Carbon dioxide, on the other hand, is a waste product and diffuses out of the cell, enters the bloodstream, and is eventually released from the lungs through respiration. Therefore, the molecule that fits the given criteria is carbon dioxide.

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  • 8. 

    During aerobic cellular respiration, which molecule originates from the digestive system?

    • Oxygen

    • ATP

    • Water

    • Glucose

    Correct Answer
    A. Glucose
    Explanation
    Glucose is the molecule that originates from the digestive system during aerobic cellular respiration. When we eat food, the digestive system breaks down carbohydrates into glucose. This glucose is then transported to the cells where it undergoes aerobic cellular respiration to produce ATP, which is the main energy currency of the cell. Oxygen is also required for aerobic respiration, but it does not originate from the digestive system. Water is a byproduct of aerobic respiration, but it is not sourced from the digestive system.

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  • 9. 

    Cytochromes are located …..

    • Within the cytoplasm of a cell

    • On the cristae of mitochondria

    • Within the matrix of mitochondria

    • Within the stroma of chloroplasts

    Correct Answer
    A. On the cristae of mitochondria
    Explanation
    Cytochromes are proteins that are involved in electron transport in cells. They are located on the cristae of mitochondria, which are the folded inner membranes of the mitochondria. The cristae provide a large surface area for the cytochromes to carry out their function of transferring electrons during cellular respiration. This location allows for efficient energy production in the form of ATP.

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  • 10. 

    Which of the following statements about aerobic cellular respiration in the human body is NOT correct?

    • Glucose and oxygen are delivered to the cells by the bloodstream.

    • Carbon dioxide and water are removed from the cells by the bloodstream.

    • ATP remains in the cytoplasm as a source of energy for the cell to do work.

    • In mitochondria, glucose is broken down where carbon dioxide, water as well as ATP are produced.

    Correct Answer
    A. In mitochondria, glucose is broken down where carbon dioxide, water as well as ATP are produced.
    Explanation
    This statement is incorrect because in mitochondria, glucose is broken down to produce carbon dioxide and water, but ATP is not produced in mitochondria. ATP is produced during the process of oxidative phosphorylation, which occurs in the inner membrane of the mitochondria.

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  • 11. 

    Which of the following statements is correct?

    • NAD is reduced and becomes NADH2 when it accepts hydrogen atoms.

    • NAD is oxidized and becomes NADH when it accepts hydrogen atoms.

    • NAD is reduced and becomes NADH2 when it releases hydrogen atoms.

    • NADH2 is reduced to NAD when the hydrogen atoms are passed to another acceptor.

    Correct Answer
    A. NAD is reduced and becomes NADH2 when it accepts hydrogen atoms.
    Explanation
    When NAD accepts hydrogen atoms, it gains electrons and is reduced to NADH2. This is because the hydrogen atoms carry electrons, and when they are transferred to NAD, it undergoes reduction. The electrons from the hydrogen atoms are then used in various metabolic reactions.

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  • 12. 

    Which of the following statements is NOT true about NAD+?

    • NAD+ can only be used once before it must be resynthesized.

    • NAD+ can accept hydrogen atoms and is reduced to NADH2.

    • NADH2 can carry the hydrogen atoms to another acceptor, becoming oxidized to NAD+ again.

    • NAD+ is involved in cellular respiration.

    Correct Answer
    A. NAD+ can only be used once before it must be resynthesized.
    Explanation
    NAD+ can be used multiple times before it needs to be resynthesized.

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  • 13. 

    Which of the following statements is NOT correct about glycolysis?

    • Glycolysis takes place within the cytoplasm.

    • Glycolysis uses two ATP but forms four ATP, resulting in a net gain of two ATP molecules.

    • During glycolysis, two molecules of NAD+ are reduced to form 2NADH + 2H+

    • Glycolysis begins with a glucose molecule and ends with four pyruvate molecules.

    Correct Answer
    A. Glycolysis begins with a glucose molecule and ends with four pyruvate molecules.
    Explanation
    During glycolysis, a glucose molecule is broken down into two molecules of pyruvate, not four. This process occurs in the cytoplasm and involves the conversion of two molecules of NAD+ to 2NADH + 2H+. Additionally, glycolysis uses two ATP molecules but produces four ATP molecules, resulting in a net gain of two ATP molecules.

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  • 14. 

    How many times does the Krebs cycle turn per glucose molecule?

    • Once

    • Twice

    • Three times

    • Four times

    Correct Answer
    A. Twice
    Explanation
    The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions that occur in the mitochondria of cells. During this cycle, a glucose molecule is broken down, resulting in the production of energy-rich molecules such as ATP. The cycle completes twice per glucose molecule, meaning that it goes through all the reactions and processes twice before the glucose molecule is fully utilized. This allows for the maximum extraction of energy from the glucose molecule.

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  • 15. 

    Which of the following molecules is NOT formed as a result of the Krebs cycle during aerobic cellular respiration?

    • NADH

    • ATP

    • ADP

    • FADH2

    Correct Answer
    A. ADP
    Explanation
    ADP is not formed as a result of the Krebs cycle during aerobic cellular respiration. The Krebs cycle produces NADH and FADH2, which are electron carriers that go on to produce ATP through the electron transport chain. ADP is the precursor molecule that gets phosphorylated to form ATP, but it is not directly formed during the Krebs cycle.

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  • 16. 

    Which molecule will combine with the four-carbon oxaloacetate in the Krebs cycle to form the six-carbon citrate?

    • Lactic acid

    • NADH

    • FADH2

    • Acetyl-CoA

    Correct Answer
    A. Acetyl-CoA
    Explanation
    Acetyl-CoA is the correct answer because it combines with the four-carbon oxaloacetate in the Krebs cycle to form the six-carbon citrate. Acetyl-CoA is a molecule that carries acetyl groups, which are two-carbon units, and in this case, it combines with the four-carbon oxaloacetate to form the six-carbon citrate.

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  • 17. 

    Which molecule is the final acceptor of electrons at the end of the electron transport system in aerobic cellular respiration?

    • Oxygen

    • Carbon dioxide

    • Lactic acid

    • Citric acid

    Correct Answer
    A. Oxygen
    Explanation
    Oxygen is the final acceptor of electrons at the end of the electron transport system in aerobic cellular respiration. During this process, electrons are passed down a series of protein complexes in the inner mitochondrial membrane, creating a proton gradient. This gradient is used to generate ATP, and at the end of the chain, oxygen accepts the electrons, forming water. This is why oxygen is essential for aerobic respiration to occur.

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  • 18. 

    Which of the following overall equations represents aerobic cellular respiration?

    • C6H12O6 -----> 2 pyruvic acids + 2 ATP

    • 6 CO2 + 6 H2O + energy -----> C6H12O6 + 6 O2

    • C6H12O6 + 6 O2 -----> 6 CO2 + 6 H2O + energy

    • C6H12O6 -----> 2 lactic acid + 2 ATP

    Correct Answer
    A. C6H12O6 + 6 O2 -----> 6 CO2 + 6 H2O + energy
    Explanation
    The correct answer represents the overall equation for aerobic cellular respiration. It shows that glucose (C6H12O6) and oxygen (O2) are used to produce carbon dioxide (CO2), water (H2O), and energy. This equation accurately represents the process of aerobic cellular respiration, where glucose is broken down in the presence of oxygen to release energy. The other options do not accurately represent this process.

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  • 19. 

    Which of the following pathways and reactions will result in the production of the most ATP molecules during aerobic cellular respiration of one glucose molecule?

    • Glycolysis

    • Krebs cycle

    • Electron transport system

    • Fermentation

    Correct Answer
    A. Electron transport system
    Explanation
    The electron transport system is the final step in aerobic cellular respiration and is responsible for the majority of ATP production. During this process, electrons from NADH and FADH2 are passed through a series of protein complexes, creating a proton gradient across the inner mitochondrial membrane. The flow of protons back across the membrane through ATP synthase generates ATP. In contrast, glycolysis only produces a small amount of ATP, the Krebs cycle produces a moderate amount, and fermentation produces no ATP. Therefore, the electron transport system is the pathway that results in the production of the most ATP molecules during aerobic cellular respiration of one glucose molecule.

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  • 20. 

    Which of the following overall equations represents fermentation that occurs in yeast cells?

    • C6H12O6 -----> 2 pyruvic acid + 2 ATP

    • C6H12O6 + 6 O2 -----> 6 CO2 + 6 H2O + energy

    • C6H12O6 -----> 2 lactic acid + 2 ATP

    • C6H12O6 -----> 2ethyl alcohol + 2 CO2 + 2 ATP

    Correct Answer
    A. C6H12O6 -----> 2ethyl alcohol + 2 CO2 + 2 ATP
    Explanation
    The correct answer is C6H12O6 → 2ethyl alcohol + 2 CO2 + 2 ATP. This equation represents fermentation in yeast cells because it shows the conversion of glucose (C6H12O6) into ethanol (ethyl alcohol) and carbon dioxide (CO2) in the absence of oxygen. This process is known as alcoholic fermentation and is commonly carried out by yeast cells to produce energy in the form of ATP.

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  • 21. 

    ______ is a series of enzymatic reactions by which glucose is incompletely metabolized to lactate or carbon dioxide and alcohol.

    • Fermentation

    • The Krebs cycle

    • The electron transport system

    • Glycolysis

    Correct Answer
    A. Fermentation
    Explanation
    Fermentation is a series of enzymatic reactions that involve the incomplete metabolism of glucose to lactate or carbon dioxide and alcohol. This process occurs in the absence of oxygen and is commonly used by microorganisms such as yeast and bacteria to produce energy. During fermentation, glucose is broken down through glycolysis, and the end products can vary depending on the specific organism involved.

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  • 22. 

    When oxygen is NOT available to an animal cell, which of the following statements is correct?

    • Only the electron transport system remains operative.

    • More hydrogen gas is produced because oxygen, the final acceptor, is not present.

    • The cells production of ATP molecules is cut.

    • Glycolysis still occurs because NADH2 passes its hydrogen atoms to pyruvate.

    Correct Answer
    A. Glycolysis still occurs because NADH2 passes its hydrogen atoms to pyruvate.
    Explanation
    When oxygen is not available to an animal cell, glycolysis still occurs because NADH2 passes its hydrogen atoms to pyruvate. This is known as fermentation, where pyruvate is converted into either lactate or ethanol, depending on the organism. This process allows the production of a small amount of ATP without the need for oxygen. The electron transport system, which requires oxygen as the final acceptor, cannot function without oxygen, so only glycolysis can continue to produce energy in the absence of oxygen.

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  • 23. 

    Out of 38 molecules of ATP produced by respiration of one glucose molecule, the number of ATP molecules produced from NADH2 are …..

    • 22 ATP

    • 36 ATP

    • 30 ATP

    • 34 ATP

    Correct Answer
    A. 30 ATP
    Explanation
    During cellular respiration, NADH2 molecules are produced in the Krebs cycle. Each NADH2 molecule can generate 3 ATP molecules through oxidative phosphorylation in the electron transport chain. Therefore, if there are 38 molecules of ATP produced from one glucose molecule, and NADH2 molecules produce 3 ATP each, the total number of ATP molecules produced from NADH2 would be 30 (38/3 = 12, 12 x 3 = 36).

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  • 24. 

    Out of 38 molecules of ATP produced by respiration of one glucose molecule, the number of ATP molecules produced from FADH2 are …..

    • 4 ATP

    • 8 ATP

    • 20 ATP

    • 22ATP

    Correct Answer
    A. 4 ATP
    Explanation
    During cellular respiration, FADH2 is produced in the electron transport chain. Each FADH2 molecule can generate 2 ATP molecules through oxidative phosphorylation. Since there are 38 molecules of ATP produced in total, and FADH2 can generate 2 ATP molecules each, the number of ATP molecules produced from FADH2 is 4.

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  • 25. 

    Inner membrane of mitochondria folds inwards, ….

    • Forming the cristae.

    • Increasing the metabolic and energy-producing activities of mitochondria.

    • Allowing a greater amount of membrane to be packed into the mitochondrion.

    • All of them.

    Correct Answer
    A. All of them.
    Explanation
    The inner membrane of mitochondria folds inwards to form the cristae, which increases the surface area available for metabolic and energy-producing activities. This folding also allows a greater amount of membrane to be packed into the mitochondrion, maximizing its efficiency. Therefore, all of the given statements are correct.

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  • 26. 

    In a complete aerobic respiration of glucose the only 5-C intermediate compound formed is …..

    • Keto-gluataric acid

    • Malic acid

    • Succinic acid

    • Oxalo-acetic acid

    Correct Answer
    A. Keto-gluataric acid
    Explanation
    In a complete aerobic respiration of glucose, keto-glutaric acid is the only 5-C intermediate compound formed. This compound is produced during the Krebs cycle, which is a series of chemical reactions that occur in the mitochondria of cells. During the Krebs cycle, glucose is broken down into smaller molecules, and one of the intermediates formed is keto-glutaric acid. This compound plays a crucial role in the production of energy in the form of ATP.

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  • 27. 

    Cellular respiration is a(an) …..

    • Anabolic process that uses O2 and CO2 to form ATP

    • Catabolic process that uses CO2, produces O2 and converts released enrgy into ATP

    • Anabolic process that uses O2, produces CO2 and converts released energy into ATP

    • Catabolic process that uses O2, produces CO2 and converts released energy into ATP

    Correct Answer
    A. Catabolic process that uses O2, produces CO2 and converts released energy into ATP
    Explanation
    Cellular respiration is a catabolic process that uses O2, produces CO2, and converts released energy into ATP. This process occurs in the mitochondria of cells and is essential for the production of energy in the form of ATP. During cellular respiration, glucose and oxygen are broken down to produce carbon dioxide, water, and ATP. This process releases energy that is stored in the chemical bonds of glucose and converts it into a usable form for the cell.

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  • 28. 

    How many molecules of ATP are produced from the cytoplasmic portion by the oxidation of 4 glucose molecules?

    • 6 ATP

    • 8 ATP

    • 10 ATP

    • 12 ATP

    Correct Answer
    A. 8 ATP
    Explanation
    The oxidation of 4 glucose molecules in the cytoplasmic portion produces 8 molecules of ATP. This is because each glucose molecule produces 2 molecules of ATP through glycolysis, resulting in a total of 8 ATP molecules.

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  • 29. 

    When two molecules of ATP are disintegrated, the amount of energy liberated is about …..

    • 9 kcal

    • 14 kcal

    • 36 kcal

    • 39 kcal

    Correct Answer
    A. 14 kcal
    Explanation
    When two molecules of ATP are disintegrated, the amount of energy liberated is about 14 kcal. ATP (adenosine triphosphate) is a molecule that stores and releases energy in cells. When ATP is broken down into ADP (adenosine diphosphate) and inorganic phosphate, energy is released. Each ATP molecule releases approximately 7 kcal of energy, so when two molecules are disintegrated, the total energy liberated is about 14 kcal.

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  • 30. 

    Out of 38 ATP molecules produced per glucose, 34 ATP molecules are formed from NADH/ FADH2 in …..

    • Glycolysis

    • Krebs cycle

    • Oxidative decarboxylation

    • Electron transport chain

    Correct Answer
    A. Electron transport chain
    Explanation
    The correct answer is Electron transport chain. Out of the 38 ATP molecules produced per glucose, 34 ATP molecules are formed from NADH/FADH2 in the Electron transport chain. This is because NADH and FADH2, which are generated in the previous steps of cellular respiration (glycolysis, Krebs cycle, and oxidative decarboxylation), donate their electrons to the electron transport chain. The electron transport chain uses these electrons to create a proton gradient, which powers the synthesis of ATP through oxidative phosphorylation.

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  • 31. 

    At the end of glycolysis, the six carbon compound ultimately is changed into ……

    • Citric acid

    • Ethyl alcohol

    • Pyruvic acids

    • Acetyl Co A

    Correct Answer
    A. Pyruvic acids
    Explanation
    At the end of glycolysis, the six carbon compound is ultimately changed into pyruvic acids. Glycolysis is the first step in cellular respiration, where glucose is broken down into two molecules of pyruvate. Pyruvic acids are then further processed in the presence of oxygen to produce ATP through the citric acid cycle and oxidative phosphorylation.

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  • 32. 

    In glycolysis, during oxidation process, electrons are removed by …..

    • ATP

    • NAD+

    • Molecular oxygen

    • Phospho glyceraldehyde

    Correct Answer
    A. NAD+
    Explanation
    During the oxidation process in glycolysis, electrons are removed by NAD+. NAD+ acts as an electron carrier and accepts the electrons from the glucose molecule, which is being oxidized. This electron transfer is essential for the production of ATP, the energy currency of the cell. NAD+ is reduced to NADH during this process, and NADH can later be used in the electron transport chain to generate more ATP.

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  • 33. 

    What is the End product of aerobic respiration?

    • Sugar and oxygen

    • Carbon dioxide, water, and energy

    • Carbon dioxide and energy

    • Water and energy

    Correct Answer
    A. Carbon dioxide, water, and energy
    Explanation
    The end product of aerobic respiration is carbon dioxide, water, and energy. During aerobic respiration, glucose (sugar) is broken down in the presence of oxygen to produce carbon dioxide and water. This process releases energy in the form of ATP (adenosine triphosphate), which is used for various cellular activities. Therefore, carbon dioxide, water, and energy are the correct end products of aerobic respiration.

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  • 34. 

    How many ATP molecules are produced by the aerobic oxidation of one molecule of glucose?

    • 30

    • 8

    • 38

    • 36

    Correct Answer
    A. 38
    Explanation
    During the process of aerobic oxidation of one molecule of glucose, a total of 38 ATP molecules are produced. This process occurs in the mitochondria and involves several steps, including glycolysis, the Krebs cycle, and the electron transport chain. These steps generate energy in the form of ATP through the process of oxidative phosphorylation. Overall, the complete breakdown of one molecule of glucose produces a net gain of 38 ATP molecules.

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  • 35. 

    How many ATP molecules are produced during one round of a Krebs cycle?

    • 1

    • 2

    • 30

    • 38

    Correct Answer
    A. 1
    Explanation
    During one round of the Krebs cycle, only one ATP molecule is directly produced. The Krebs cycle is a series of chemical reactions that occur in the mitochondria, and it is responsible for generating energy-rich molecules like ATP. In each round of the cycle, one ATP molecule is produced through substrate-level phosphorylation, where a phosphate group is transferred from a molecule to ADP, forming ATP. The other ATP molecules that are generated during cellular respiration come from oxidative phosphorylation, which occurs in the electron transport chain. Therefore, the correct answer is 1.

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  • 36. 

    Out of the 38 molecules of ATP produced from the complete oxidation of one glucose molecule, how many ATP are produced in the cytoplasm?

    • 30

    • 8

    • 34

    • 2

    Correct Answer
    A. 2
    Explanation
    During the process of cellular respiration, the complete oxidation of one glucose molecule produces a total of 38 molecules of ATP. However, only 2 molecules of ATP are produced in the cytoplasm. The majority of ATP production occurs in the mitochondria through the processes of glycolysis, the Krebs cycle, and oxidative phosphorylation. Therefore, the correct answer is 2.

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  • 37. 

    Oxidative phosphorylation is production of …....

    • ADP in photosynthesis

    • NADPH in photosynthesis

    • ATP in respiration

    • NADH2 in respiration.

    Correct Answer
    A. ATP in respiration
    Explanation
    Oxidative phosphorylation is the process in which ATP is produced during cellular respiration. It occurs in the mitochondria and involves the transfer of electrons from NADH and FADH2 to the electron transport chain, which generates a proton gradient across the inner mitochondrial membrane. This gradient is then used by ATP synthase to produce ATP. Therefore, the correct answer is ATP in respiration.

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  • 38. 

    Which of the following is the End product of citric acid cycle?

    • Citric acid

    • Lactic acid

    • Pyruvic acid

    • CO2 + H2O

    Correct Answer
    A. CO2 + H2O
    Explanation
    The end product of the citric acid cycle is CO2 + H2O. This is because during the cycle, acetyl CoA is oxidized and broken down into CO2, releasing energy in the process. The CO2 is then excreted as waste, while the H2O is a byproduct of the electron transport chain, which is the final step of cellular respiration. Therefore, CO2 + H2O is the correct answer as it represents the final products of the citric acid cycle.

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  • 39. 

    During cellular respiration reactions……. molecules of CO2 are produced from the complete oxidation of one molecule of pyruvic acid.

    • 3

    • 2

    • 1

    • 6

    Correct Answer
    A. 3
    Explanation
    During cellular respiration, pyruvic acid is converted into carbon dioxide (CO2) through a series of reactions. One molecule of pyruvic acid undergoes complete oxidation, resulting in the production of three molecules of CO2. This process occurs in the mitochondria of cells and is an essential step in generating energy for cellular activities.

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  • 40. 

    Electron Transport Chain produces…….

    • ATP

    • ADP

    • FADH2

    • NADH

    Correct Answer
    A. ATP
    Explanation
    The electron transport chain is a series of protein complexes located in the inner membrane of the mitochondria. It plays a crucial role in cellular respiration by transferring electrons from NADH and FADH2 to oxygen, ultimately generating ATP. ATP is the main energy currency of the cell and is produced during oxidative phosphorylation, the final step of the electron transport chain. Therefore, the correct answer is ATP.

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  • 41. 

    What do FADH2 and NADH bring to the electron transport chain?

    • High energy protons

    • Oxygen Gas

    • High energy electrons

    • Water

    Correct Answer
    A. High energy electrons
    Explanation
    FADH2 and NADH bring high energy electrons to the electron transport chain. These molecules are produced during the Krebs cycle and glycolysis, where they pick up high energy electrons from glucose molecules. These electrons are then transferred to the electron transport chain, where they are used to generate ATP through oxidative phosphorylation. The electrons pass through a series of protein complexes in the electron transport chain, creating a proton gradient that drives the synthesis of ATP. Therefore, FADH2 and NADH play a crucial role in providing the high energy electrons needed for ATP production.

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  • 42. 

    Which of the following carrier molecules, hold more energy?

    • FADH2

    • NAD+

    • ADP

    • NADH

    Correct Answer
    A. NADH
    Explanation
    NADH holds more energy compared to the other carrier molecules listed. NADH is the reduced form of NAD+ and is a high-energy molecule that carries electrons and hydrogen ions to the electron transport chain in cellular respiration. It is involved in the production of ATP, the main energy currency of cells. FADH2 is also a carrier molecule, but it carries fewer electrons and therefore holds less energy compared to NADH. ADP is not a carrier molecule, but rather a precursor molecule for ATP synthesis.

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  • 43. 
    In the figure below, what happens if the bond between the two phosphate groups number 2 and 3 breaks down in cellular respiration. All of the following statements are true except …… - ProProfs

    In the figure below, what happens if the bond between the two phosphate groups number 2 and 3 breaks down in cellular respiration. All of the following statements are true except ……

    • An amount of energy of about 7 K.cal is released.

    • A molecule of ADP is produced.

    • The compound loses a phosphate group.

    • Carbon dioxide is released.

    Correct Answer
    A. Carbon dioxide is released.
    Explanation
    When the bond between the two phosphate groups number 2 and 3 breaks down in cellular respiration, all of the following statements are true except that carbon dioxide is released. This is because carbon dioxide is not directly involved in the breakdown of the bond between the phosphate groups. Instead, when this bond breaks, an amount of energy of about 7 K.cal is released, a molecule of ADP is produced, and the compound loses a phosphate group. Carbon dioxide is produced in a later step of cellular respiration.

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  • 44. 

    All of the following statements are good reasons for considering ATP the energy currency of the cell except ………

    • It is the molecule that all living organisms use for energy.

    • It can easily break to release energy.

    • It is hydrolyzed into ADP + Pi, both of which re-enter mitochondria for “recycling” back into ATP.

    • It consists of an adenine base attached to a ribose sugar, which in turn is attached to a triphosphate group.

    Correct Answer
    A. It consists of an adenine base attached to a ribose sugar, which in turn is attached to a triphosphate group.
  • 45. 
    Match the columns below ….. - ProProfs

    Match the columns below …..

    •   a – 2 / b – 5 / c – 3 / d – 1

    •   a – 5 / b – 1 / c – 4 / d – 2

    •   a – 3 / b – 1 / c – 4 / d – 2

    •   a – 5 / b – 3 / c – 1 / d – 2

    Correct Answer
    A.   a – 5 / b – 1 / c – 4 / d – 2
    Explanation
    The correct answer is a - 5 / b - 1 / c - 4 / d - 2. This is because each column should be matched with the corresponding number that appears in the same row. In the given options, a is matched with 5, b is matched with 1, c is matched with 4, and d is matched with 2.

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  • 46. 

    How many molecules of NADH are produced when four molecules of phospho-glyceraldehyde are converted into pyruvic acids during cellular respiration?

    • 2

    • 6

    • 8

    • 4

    Correct Answer
    A. 4
    Explanation
    During cellular respiration, each molecule of phospho-glyceraldehyde produces 1 molecule of NADH. Since there are four molecules of phospho-glyceraldehyde, the total number of molecules of NADH produced is 4.

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  • 47. 

    Which one is among the products of aerobic respiration?

    • Malic acid

    • Ethyl alcohol

    • Pyruvic acid

    • Lactic acid

    Correct Answer
    A. Malic acid
    Explanation
    Malic acid is among the products of aerobic respiration. During aerobic respiration, glucose is broken down in the presence of oxygen to produce energy in the form of ATP. One of the intermediate products in this process is pyruvic acid. Pyruvic acid can then be further metabolized to produce different end products depending on the presence or absence of oxygen. In the absence of oxygen, pyruvic acid is converted into lactic acid, while in the presence of oxygen, it is converted into acetyl CoA, which can then be used in the Krebs cycle to produce energy. Malic acid is one of the intermediate products formed during the conversion of pyruvic acid to acetyl CoA in aerobic respiration.

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  • 48. 
    The diagram below shows an important process for living organisms. What are the numbers 1, 2, 3, 4, and 5 respectively? - ProProfs

    The diagram below shows an important process for living organisms. What are the numbers 1, 2, 3, 4, and 5 respectively?

    • Muscles, Yeast, 2NADH, 2ATP, 2CO2

    • Yeast, Bacteria, 2CO2, 2ATP, 2 lactic acid

    • Yeast, muscles, 2CO2, 2ADP, 2 lactic acid

    • Bacteria, Yeast, 2 lactic acid, 2NAD+, 2CO2

    Correct Answer
    A. Yeast, Bacteria, 2CO2, 2ATP, 2 lactic acid
    Explanation
    The correct answer is Yeast, Bacteria, 2CO2, 2ATP, 2 lactic acid. This is because yeast and bacteria are mentioned in the first two positions, indicating that they are involved in the process. The presence of 2CO2 and 2 lactic acid suggests that these are the products of the process. Finally, the presence of 2ATP indicates that ATP is also produced during the process.

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  • 49. 

    When oxygen is revealed pyruvic acid, ……

    • Supplies energy to living cells through the citric acid cycle

    • Is converted to ethyl alcohol

    • Reforms PGAL molecules

    • Is converted to lactic acid

    Correct Answer
    A. Supplies energy to living cells through the citric acid cycle
    Explanation
    When oxygen is revealed pyruvic acid, it undergoes a series of reactions known as the citric acid cycle, also known as the Krebs cycle. This cycle takes place in the mitochondria of the cell and is an essential step in the process of cellular respiration. Through the citric acid cycle, pyruvic acid is broken down further, releasing energy in the form of ATP. This energy is then used by the cell for various metabolic processes. Therefore, the correct answer is that oxygen supplies energy to living cells through the citric acid cycle.

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  • Current Version
  • Mar 09, 2023
    Quiz Edited by
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  • Jul 23, 2020
    Quiz Created by
    Samy

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