Quiz 3 Ch. 5,6

20 Questions | Total Attempts: 116

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Molecule Quizzes & Trivia

Quiz over chapters 5 and 6 in Campbell and Reece book. Missing questions 9 and 14-25 because they had pictures of molecules way too complex for me to waste my time trying to draw!


Questions and Answers
  • 1. 
    Which of the following best summarizes the relationship between dehydration reactions and hydrolysis?
    • A. 

      Dehydration reactions assemble polymers, and hydrolysis breaks them down

    • B. 

      Hydrolysis occurs during th day, and dehydration reactions happen at night.

    • C. 

      Dehydration reactions can occur only after hydrolysis.

    • D. 

      Hydrolysis creates monomers, and dehydration reactions destroy them

    • E. 

      Dehydration reactions accur in plants, and hydrolysis happens in animals

  • 2. 
    Carbohydrates normally function in animals as
    • A. 

      The functional units of lipids

    • B. 

      Enzymes in the regulation of metabolic processes

    • C. 

      A component of triglycerides

    • D. 

      Energy-storage molecules

    • E. 

      Sites of protein synthesis

  • 3. 
    Which of the following is true of both starch and cellulose?
    • A. 

      They are both polymers of glucose

    • B. 

      They are geometric isomers of each other

    • C. 

      They can both be digested by humans

    • D. 

      They are both used for energy storage in plants

    • E. 

      They are both structural components of the plant cell wall

  • 4. 
    What is a fat or triacylglycerol
    • A. 

      A protein with tertiary structure

    • B. 

      A lipid made of three fatty acids and glycerol

    • C. 

      A kind of lipid that makes up much of the plasma membrane

    • D. 

      A molecule formed from three alcohols

    • E. 

      A carbohydrate with three sugars

  • 5. 
    The hydrogenation of vegetable oil would result in
    • A. 

      A decrease in the number of carbon-carbon double bonds in the oil molecules

    • B. 

      An increase in the number of hydrogen atoms in the oil molecules

    • C. 

      The oil being a solid at room temperature

    • D. 

      Two of the above

    • E. 

      All of the above

  • 6. 
    The 20 different amino acids found in polypeptides exhibit different chemical and physical properties because of different
    • A. 

      Carboxyl groups

    • B. 

      Amino groups

    • C. 

      Side chains (R groups)

    • D. 

      Tertiary structure

    • E. 

      Both A and B are correct

  • 7. 
    At which level of protein structure are interactions between R groups most important?
    • A. 

      Primary

    • B. 

      Secondary

    • C. 

      Tertiary

    • D. 

      Quaternary

    • E. 

      They are equally important at alll levels

  • 8. 
    A change in a protein's three-dimensional shape or conformation due to disruption of hydrogen bonds, disulfide bridges, and ionic bonds is termed
    • A. 

      Hydrolysis

    • B. 

      Stabilization

    • C. 

      Destabilization

    • D. 

      Renaturation

    • E. 

      Denaturation

  • 9. 
    Which of the following are nitrogen bases of the pyrimidine type?
    • A. 

      Guanine and glucose

    • B. 

      Cytosine and sucrose

    • C. 

      Thymine and cytosine

    • D. 

      Ribose and deoxyribose

    • E. 

      Glycerol and glycogen

  • 10. 
    Metabolism is best described as
    • A. 

      Synthesis of macromolecules

    • B. 

      Breakdown of macromolecules

    • C. 

      Control of enxyme activity

    • D. 

      A and B

    • E. 

      A,B, and C

  • 11. 
    Which of the following is true regarding catabolic pathways?
    • A. 

      They do not depend on enzymes

    • B. 

      They consume energy to build up polymers from monomers

    • C. 

      They release energy as they degrade polymers to monomers

    • D. 

      They lead to the synthesis of catabolic compunds

    • E. 

      Both A and B are correct

  • 12. 
    Anabolic pathways
    • A. 

      Do not depend on enzymes

    • B. 

      Depend on enzymes

    • C. 

      Consume energy to build up polymers from monomers

    • D. 

      Release energy as they degrade polumers to monomers

    • E. 

      Both B and C are correct

  • 13. 
    Which of the following is part of the first law of thermodynamics?
    • A. 

      Energy cannot be created or destroyed

    • B. 

      The entropy of the universe is decreasing

    • C. 

      The entropy of the universe is constant

    • D. 

      Kinetic energy is stored energy that results from the specific arrangement of matter

    • E. 

      Energy cannot be fransferred or transformed

  • 14. 
    According to the second law of thermodynamics
    • A. 

      The entropy of the universe is constantly increasing

    • B. 

      For every action there is an equal and opposite reaction

    • C. 

      Every energy transfer requires activation energy from the environment

    • D. 

      The total amount of energy in the universe is conserved or constant

    • E. 

      Energy can be transgerred or transformed, but it can be neither created nor destroyed

  • 15. 
    Which of the following would decrease the entropy within a system?
    • A. 

      Dehydration reactions

    • B. 

      Hydrolysis

    • C. 

      Respiration

    • D. 

      Digestion

    • E. 

      Catabolism

  • 16. 
    Which of the following is true for exergonic reactions?
    • A. 

      The products have more free energy than the reactants

    • B. 

      The products have less free energy than the reactants

    • C. 

      Reactants will always be completely converted to products

    • D. 

      A net input of energy from the surroundings in required for the reactions to proceed

    • E. 

      The reactions upgrade the free energy in the products at the expense of energy from the surroundings

  • 17. 
    When a protein forms from amino acids, the following chages apply:
    • A. 

      +/\H, -/\S, +/\G

    • B. 

      +/\H, -/\S, -/\G

    • C. 

      +/\H, +/\S, +/\G

    • D. 

      -/\H, -/\S, +/\G

    • E. 

      -/\H, +/\S, +/\G

  • 18. 
    ATP generally energizes a cellular process by
    • A. 

      Releasing heat upon hydrolysis

    • B. 

      Acting as a catalyst

    • C. 

      Direct chemical transfer of a phosphate group

    • D. 

      Releasing ribose electrons to drive reactions

    • E. 

      Emitting light flashes

  • 19. 
    This question and the question below both follow the following supplied information:A series of enzymes catalyze the reaction X->Y->Z->A. Product A binds to the enzyme that converts X to Y at a position remote from its active site. This binding decreases the activity of the enzyme.Substance X is
    • A. 

      A coenzyme

    • B. 

      An allosteric inhibitor

    • C. 

      A substrate

    • D. 

      An intermediate

    • E. 

      The product

  • 20. 
    Substance A functions as
    • A. 

      A coenzyme

    • B. 

      An allosteric inhibitor

    • C. 

      The substrate

    • D. 

      An intermediate

    • E. 

      A competitive inhibitor