Biology Practice Test: MCQ Quiz

24 Questions | Total Attempts: 62

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Biology Practice Test: MCQ Quiz

Are you interested in the subject of biology? Could you pass a biology quiz? Biology is a branch of natural science and is very important to our daily lives. As a study of life and living organisms, it attempts to establish relationships and interaction between two significant aspects of life. This association includes plants and animals. Take this quiz and learn more about biology


Questions and Answers
  • 1. 
    What would happen if there was a mutation to Complex I and Complex II of the electron transport chain of cellular respiration so that it could not oxidize NADH?
    • A. 

      The proton gradient would not form because the electrons from NADH could not be obtained. No ATP synthesis would occur.

    • B. 

      The proton gradient would be created more rapidly since NADH would donate its electrons more readily. ATP synthesis would increase.

    • C. 

      The electrons would still pass from Complex III and Complex IV to create a smaller proton gradient. Not as much ATP could be made.

    • D. 

      The protons from the matrix would have to diffuse through the membrane to maintain the proton gradient needed for ATP synthase.

    • E. 

      Electrons from the proton gradient would be donated to Complex I so that it could function normally.

  • 2. 
    Imagine that there were a high concentration of a strong oxidizing agent in the stroma that is able to spontaneously take electrons from NADPH. The strong oxidizing agent is unable to donate electrons back once it has obtained them. What would you expect to happen to the reactions of photosynthesis?  
    • A. 

      The light reactions would slow down since the supply of NADPH would decrease.

    • B. 

      The light reactions would speed up since there would be an increase in electron availability.

    • C. 

      NADPH would be reduced and the Calvin Cycle would occur more rapidly.

    • D. 

      NADPH would be oxidized and the Calvin Cycle would cease to happen.

  • 3. 
    At the beginning of oxidative phosphorylation, electrons from NADH are passed to the Complex I protein in the mitochondria. In terms of redox chemistry, what is the role of NADH in this system?
    • A. 

      It is the oxidizing agent

    • B. 

      It is the reducing agent

    • C. 

      It will accept electrons from Complex I and NADH become reduced

    • D. 

      It will donate electrons to Complex I and NADH become reduced.

  • 4. 
    Why would a molecule of fat yield a more negative change in free energy value than a molecule of glucose?
    • A. 

      A molecule of fat has oxygen-hydrogen bonds, which contain more energy than the carbon-carbon bonds in glucose

    • B. 

      A molecule of fat has more non-polar covalent bonds that absorb more energy when broken than the polar covalent bonds in glucose

    • C. 

      A molecule of fat has more polar covalent bonds that give off more energy when broken than the polar covalent bonds in glucose

    • D. 

      A molecule of fat has a longer chain and therefore has more bonds to release energy, and a molecule of glucose has less available bonds to break

  • 5. 
    The movement of electrons down the ETC relies on upon, in part, that the electron entering the chain has high potential energy, which allows the electron to travel along to the end without any outside energy input, rather, releasing free energy in a spontaneous reaction. What is another reason for why the electrons would easily be found traveling down the chain?
    • A. 

      The final electron acceptor, oxygen, is very polar

    • B. 

      The final electron acceptor, oxygen, is electropositive

    • C. 

      The final electron acceptor, oxygen has a relatively high electronegativity, and therefore causes the driving force for the electrons to move down the chain

    • D. 

      The final electron acceptor, oxygen, is electronegative, therefore, the electrons moving down the ETC will be attracted to it

  • 6. 
    The following polar amino acids: Serine, Threonine, and Tyrosine make up part of a trans-membrane protein. Where would this portion of the protein most likely be located?
    • A. 

      A. Outside the cell (in the extracellular matrix)

    • B. 

      B. Inside the cell (in the cytoplasm)

    • C. 

      C. Passing through the lipid bilayer of the membrane

    • D. 

      A and B

  • 7. 
    How many of the following molecules would be able to dissolve in a polar solution? CH4, H2O, NO2, N2, NH3, H2
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

  • 8. 
    What is the pH of a solution that has an H+ concentration of 1 x10^-2 M?
    • A. 

      2

    • B. 

      100

    • C. 

      10

    • D. 

      2 M

  • 9. 
    In a cell, where would you expect to see an H+ concentration of 3.2x10^-5 M?
    • A. 

      A. Matrix of a mitochondria

    • B. 

      B. Smooth endoplasmic reticulum

    • C. 

      C. Nucleus

    • D. 

      D. Lysosome

    • E. 

      E. A and B

  • 10. 
    Let’s say that your blood has an unusually high concentration of H+ ions. Using your knowledge of the bicarbonate buffering system, what would happen to restore equilibrium?
    • A. 

      The H+ ions would combine with bicarbonate (HCO3-) to form carbonic acid (H2CO3), which would dissociate to form CO2 and H20. CO2 would be exhaled.

    • B. 

      Respiration would increase and subsequently increase CO2 in the blood, which would combine with the H+ to neutralize the H+ ions.

    • C. 

      The H+ ions would combine with carbonic acid (H2CO3) to increase bicarbonate (HCO3-), which is a base, thereby neutralizing the acidity.

  • 11. 
    How many molecules of G3P could be synthesized in the Calvin Cycle if there is an abundant source of CO2, 90,000 ATP, and 100,000 NADPH?
    • A. 

      16,666

    • B. 

      11,111

    • C. 

      10,000

    • D. 

      15,000

  • 12. 
    A cell releases a signal to neighboring cells to tell them to stop dividing. The cells receiving this information must…
    • A. 

      Have receptors that will bind the signaling molecule, and undergo a signal transduction pathway

    • B. 

      Have receptors that bind to the signaling molecule, respond with the activation of the signal transduction pathway, and finally respond by ceasing cell division

    • C. 

      Have ligands that bind to the signaling molecule, and immediately responds by ceasing further cell division

    • D. 

      Have sugars protruding into the extracellular matrix to sense the signal and cause the activation of the signal transduction pathway, which in turn causes the cell to respond by ceasing further cell division

  • 13. 
    What is the main difference between primary active transport and secondary active transport?
    • A. 

      Only primary active transport can create an electrochemical gradient

    • B. 

      Secondary active transport only involves the movement of solutes up their gradient

    • C. 

      Primary Active Transporters are considered “pumps” and secondary active transporters are not

    • D. 

      Primary active transport requires ATP and secondary active transport does not

  • 14. 
    The concentration of OH- inside the thylakoid is 10^-10 M and the concentration of OH- in the stroma is 10^-3 M. Why does this environment allow for ATP synthase to form ATP?
    • A. 

      There is a higher pH in the thylakoid so protons can be pumped out of the thylakoid via ATP synthase and synthesize ATP.

    • B. 

      There is a lower pH in the thylakoid so protons can be pumped out of the thylakoid via ATP synthase and synthesize ATP.

    • C. 

      The smaller proton gradient in the thylakoid would allow ATP synthase to use the protons in the gradient to make ATP.gradient in the stroma to move protons to the thylakoid and synthesize ATP in the thylakoid.

    • D. 

      There is high hydroxyl concentration in the the thylakoid which can move through the ATP synthase and make ATP.

  • 15. 
    When you walk, you must place your foot on the ground, in front of you, and push down and back to propel yourself forward. Then, you release your foot from its position, move it forward relative to the ground, and repeat the process. This movement is analogous to the movement of myosin. What function does this action reflect at the cellular level?
    • A. 

      Muscle contraction

    • B. 

      The separation of chromosomes

    • C. 

      The bending of cilia and flagella

    • D. 

      Movement of cargo such as a vesicle

  • 16. 
    A protein does not have beta-pleated sheets or alpha-helices. It was found to have disulfide bridges and hydrophobic interactions. This protein was further examined and revealed that it was made up of one polypeptide chain. Which levels of protein structures are present?
    • A. 

      Primary, Tertiary, Quaternary

    • B. 

      Tertiary only

    • C. 

      Primary, Tertiary

    • D. 

      Primary, Secondary

  • 17. 
    Which of the following is not a similarity between flagella and cilia?
    • A. 

      The way in which they move.

    • B. 

      The 9-2 arrangement of microtubules.

    • C. 

      They both use the motor protein dynein

    • D. 

      Both are found in eukaryotic cells.

  • 18. 
    When water forms hydrogen bonds with other molecules, it…
    • A. 

      Is dissolving a small, polar, or charged molecule

    • B. 

      Is it dissolving a small, polar molecule

    • C. 

      Is only forming hydrogen bonds, because water cannot dissolve anything without breaking bonds

    • D. 

      Is dissolving the molecule by breaking the bonds in that molecule and replacing them with hydrogen bonds

  • 19. 
    Cellulose is made of long, linear chains of glucose molecules, which allows for it to be able to provide rigidity to a cell. Why is cellulose be able to provide this function?
    • A. 

      This is because cellulose is polar and can allow the cell membrane of a cell to create a strong covalent bond to it

    • B. 

      This is because cellulose is non-polar, and can allow for extensive hydrogen bonding between its chains

    • C. 

      This is because the cellulose is polar, and can allow for extensive hydrogen bonding between its chains

    • D. 

      This is because cellulose has many non-polar covalent bonds, which are, in general, stronger bonds than polar-covalent bonds, and therefore, will hold its structure well

  • 20. 
    Why do the fatty acid tails of a phospholipid bilayer of the cell membrane orient themselves inwards (towards each other)?
    • A. 

      The fatty acid tails are attracted to each other because the atoms involved are charged

    • B. 

      The fatty acids are very polar and do not want to interact with the non-polar surroundings of the cell (the extracellular fluid and cytosol)

    • C. 

      The fatty acid tails form strong hydrophillic interactions to keep them together

    • D. 

      The atoms that make up the bonds in the fatty acid tails have similar electronegativities

  • 21. 
    In photosynthesis, sugars are synthesized. The cell must have had an initial input of energy from sunlight in order to synthesize the bonds that are found in the resulting sugar molecule, which contains the energy from sunlight in the form of chemical potential energy. Which of the following must be true about the process of photosynthesis?
    • A. 

      NADPH contributes to the H+ gradient, which provides the energy to drive the formation of sugars

    • B. 

      High energy electrons (which obtain energy from the sunlight) gain energy as they move down the ETC, producing the H+ gradient that drives ATP synthesis

    • C. 

      The ATP that is produced in the Light reactions provides the energy that is required to form the bonds in sugars

    • D. 

      The energy released from the breaking of bonds in NADPH at the Calvin Cycle provide the energy to form the bonds between sugars

    • E. 

      B and C

  • 22. 
    During ATP synthesis in plant and animal cells, which of the following place(s) would there be a noticeably acidic environment?
    • A. 

      The intermembrane space of the mitochondria

    • B. 

      The lumen of the chloroplast thylakoids

    • C. 

      The matrix of the mitochondria

    • D. 

      A and B

    • E. 

      B and C

  • 23. 
    The plasma membrane of a cell is beginning to degrade and needs to be repaired. Which of the following structures would begin to synthesize molecules to restore the plasma membrane?
    • A. 

      Smooth Endoplasmic reticulum

    • B. 

      Rough Endoplasmic Reticulum

    • C. 

      Mitochondria

    • D. 

      Golgi apparatus

  • 24. 
    Living organisms that live in the presence of oxygen are susceptible to having their DNA damage by oxidation. Antioxidants are molecules that are able to donate electrons to DNA and repair damage done to the DNA. What role do antioxidants play in reduction/oxidation reactions in organisms?  
    • A. 

      The antioxidants are oxidizing agents and oxidize the damaged DNA.

    • B. 

      The antioxidants are oxidizing agents and reduce the damaged DNA.

    • C. 

      The antioxidants are reducing agents and reduce the damaged DNA.

    • D. 

      The antioxidants are reducing agents and oxidize the damaged DNA.