Quiz: Cellular And Molecular Biology

55 Questions | Total Attempts: 1891

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Quiz: Cellular And Molecular Biology - Quiz

Have you studied cellular and molecular biology well? Take this cellular and molecular biology quiz, and see how much you know about these topics. It is basically the study of the structure and function of organisms and biological processes at the level of cells and the macromolecules that define them. You can either practice or test your knowledge here, and your scores will say it all. All the best! Do not forget to share the quiz results with other medical people.


Questions and Answers
  • 1. 
    The sodium-potassium pump makes the cell interior more ______ by pumping ____ sodium ions out of the cell for every ____ potassium ions pumped in.
    • A. 

      Negative, 3, 2

    • B. 

      Negative, 2, 3

    • C. 

      Positive, 3, 2

    • D. 

      Positive, 2, 3

    • E. 

      Negative, 4, 3

  • 2. 
    What is the distinguishing characteristic of a P-type pump?
    • A. 

      It must be pumped during the cycle.

    • B. 

      It must be phosphorylated during the cycle.

    • C. 

      It must be protonated during the cycle.

    • D. 

      It must be deprotonated during the cycle.

    • E. 

      It must be potassiumated during the cycle.

  • 3. 
    In the Na+/glucose cotransporter, _____ moving down its/their gradient drive the transport of _____ against its/their gradient.
    • A. 

      Na+ ions, K+ ions

    • B. 

      Na+ ions, glucose

    • C. 

      Glucose, Na+ ions

    • D. 

      K+ ions, glucose

    • E. 

      Glucose, K+ ions

  • 4. 
    Which enzyme of the Krebs (TCA) cycle is different from the others with respect to its location, and where is it located?
    • A. 

      Succinate dehydrogenase, mitochondrial matrix

    • B. 

      Malate dehydrogenase, mitochondrial matrix

    • C. 

      Succinate dehydrogenase, inner mitochondrial membrane

    • D. 

      Malate dehydrogenase, inner mitochondrial membrane

    • E. 

      Succinate dehydrogenase, intermembrane space

  • 5. 
    The movement of water through a semipermeable membrane from a region of higher water concentration to a region of lower water concentration is called ________.
    • A. 

      Diffusion

    • B. 

      Osmosis

    • C. 

      Denaturation

    • D. 

      Metabolism

    • E. 

      Solubility

  • 6. 
    The phosphorylation of glucose to generate glucose-6-phosphate is catalyzed by the enzyme hexokinase. This enzyme, however, is inhibited by its own product, glucose-6-phosphate. This is an example of
    • A. 

      Allosteric regulation

    • B. 

      Irreversible inhibition

    • C. 

      Non-covalent modification

    • D. 

      Feedback regulation

    • E. 

      Covalent modification

  • 7. 
    A protein extract containing an enzyme of interest is prepared from a tissue. The enzyme activity is tested using a panel of suspected substrates. However, the enzyme is not active, leading to the conclusion that none of the compounds is the enzyme’s substrate. One student of Biol218-003 suggests adding ATP to the enzyme mixture. Suddenly a reaction is observed in one of the tubes. After adding ATP, the enzyme was purified, and one of its amino acids had a phosphate group. This is an example of
    • A. 

      Lucky guess

    • B. 

      Covalent modification of enzymes

    • C. 

      Activation of the enzymatic activity by a kinase

    • D. 

      B and c

  • 8. 
    A transport system that moves two solutes into the cell during a single cycle accompanied by no expenditure of energy could be called a(n) ________
    • A. 

      Active antiport

    • B. 

      Active uniport

    • C. 

      Passive antiport

    • D. 

      Active symport

    • E. 

      Passive symport

  • 9. 
    Feedback inhibitors bind to the
    • A. 

      Allosteric site

    • B. 

      Active site

    • C. 

      Substrate

    • D. 

      Cofactor

    • E. 

      A and b

  • 10. 
    Which type of RNA brings the amino acids to the ribosomes during protein synthesis?
    • A. 

      SRNA

    • B. 

      RRNA

    • C. 

      TRNA

    • D. 

      MRNA

  • 11. 
    The inner membrane of the mitochondria has a high protein tolipid ratio because it contains ____________.
    • A. 

      Electron transport chain

    • B. 

      ATP synthase

    • C. 

      Cardiolysin

    • D. 

      A and b

    • E. 

      A and c

  • 12. 
    What is the purpose of uncoupling proteins in mammalian brown adipose tissue (baby fat)?
    • A. 

      They help the tissue expand and contract when needed.

    • B. 

      They function as a source of heat production during exposure to cold temperatures.

    • C. 

      They allow the production of a larger number of ATPs per glucose.

    • D. 

      They allow muscles to contract more efficiently.

    • E. 

      They give the tissue its color.

  • 13. 
    Which molecule below plays a key role in regulating the rate of glycolysis and Krebs cycle by regulating the activity of key enzymes?
    • A. 

      ADP

    • B. 

      ATP

    • C. 

      Inorganic Phosphate

    • D. 

      Molecular oxygen

    • E. 

      None of the above

  • 14. 
    Metabolic pathways that make available raw materials from which other molecules can be synthesized and that provide chemical energy required for many cell activities are known as ______.
    • A. 

      Anabolism

    • B. 

      Catabolism

    • C. 

      Manabolism

    • D. 

      Allosterism

  • 15. 
    A reaction involving the gain of one or more electrons is a(n) _________ reaction.
    • A. 

      Oxidation

    • B. 

      Reduction

    • C. 

      Inclusion

    • D. 

      Elimination

    • E. 

      None of the above

  • 16. 
    In order to take full advantage of the energy released during an exergonic reaction, it is ______________.
    • A. 

      Done in small steps

    • B. 

      Used to drive the temperature of the cells up

    • C. 

      Coupled to an endergonic reaction

    • D. 

      Coupled to another exergonic reaction

  • 17. 
    Which of the following is the primary function of fermentation?
    • A. 

      Completely break down a glucose molecule to carbon dioxide and water

    • B. 

      Produce ATP by chemiosmosis

    • C. 

      Oxidize NAD+ to NADH

    • D. 

      Oxidize NADH to NAD+

    • E. 

      All of the above

  • 18. 
    Which reaction below might be a suitable coupled reaction for the reaction A + B <—> C + D (ÄG = +6.7 kcal/mole)?
    • A. 

      E + F G + H (ÄG = -5.4 kcal/mole)

    • B. 

      C + F G + H (ÄG = -5.4 kcal/mole)

    • C. 

      E + F G + H (ÄG = -8.3 kcal/mole)

    • D. 

      E + F G + H (ÄG = -9.7 kcal/mole)

    • E. 

      None of them

  • 19. 
    The outer membrane of the mitochondria has large channels surrounded by a Beta barrel called _________________.
    • A. 

      Proton pump

    • B. 

      Cardiolipin

    • C. 

      Porins

    • D. 

      Cytochrome complex

    • E. 

      ATP synthesis

  • 20. 
    The redox centers of most of the proteins of the respiratory chain are made up of _________________.
    • A. 

      Flavoproteins

    • B. 

      Vitamins

    • C. 

      Prosthetic groups

    • D. 

      Cytochromes

    • E. 

      Ubiquinone

  • 21. 
    An electrochemical gradient is caused by __________________.
    • A. 

      Energy distribution

    • B. 

      Voltage gradient

    • C. 

      Concentration gradient

    • D. 

      A and b

    • E. 

      B and c

  • 22. 
    Which molecule is the final electron acceptor in the electron transport chain?
    • A. 

      ATP

    • B. 

      Water

    • C. 

      NADH

    • D. 

      Oxygen

    • E. 

      FADH2

  • 23. 
    Diffusion during which the substance to be transported binds selectively to a membrane-spanning protein, which helps the process along, is called ________.
    • A. 

      Osmosis

    • B. 

      Facilitated Osmosis

    • C. 

      Simple Diffusion

    • D. 

      Facilitated Diffusion

    • E. 

      Active Transport

  • 24. 
    An important aspect of transport by facilitated transporters and pumps is
    • A. 

      Conformational shifts

    • B. 

      Rigidity softness

    • C. 

      á-helix

    • D. 

      B-pleated sheet

  • 25. 
    The site of aerobic respiration (electron transport chain) and ATP formation is in the _________________ of the Mitochondria.
    • A. 

      Outer membrane

    • B. 

      Matrix

    • C. 

      Inner membrane

    • D. 

      Intermembrane space

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