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Biochemistry (Exam 3): Practice Exam Questions

Biochemistry21 CardsCreated 4 months ago

This deck covers key biochemistry concepts, including lipid structures, DNA and RNA differences, membrane fluidity, and enzyme activation. It is designed to help students prepare for Exam 3 by reinforcing important definitions and relationships.

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1. Which of the following lipid molecules possess a different fundamental structural
make-up from the others?
a. Fatty acids
b. Cholesterol
c. Triglycerides
d. Sphingolipids
e. Glycolipids

b. (cholesterol)
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Key Terms

Term
Definition

1. Which of the following lipid molecules possess a different fundamental structural
make-up from the others?
a. Fatty acids
b. Cholesterol
c. Triglycerides
d. Sphingolipids
e. Glycolipids

b. (cholesterol)

2. What does amphipathic mean?
a. having both positive and negative charges
b. having both acid and base properties
c. having both hydrophilic and hydrophobic regions
d. having two stereoisomers

c. (having both hydrophilic and hydrophobic regions)

3. Which of the following four fatty acids has the lowest melting point?
a. CH3CH2CH2CH2CH2COOH
b. CH3CH2CH2CH2CH2CH2CH2CH2CH2COOH
c. CH3CH2CH2CH2CH2CH2CH2COOH
d. CH3CH=CHCH2CH2COOH

d. (CH3CH=CHCH2CH2COOH)

4. How does the presence of cis double bonds in fatty acids affect membrane fluidity?
a. They tend to increase the fluidity.
b. They tend to decrease the fluidity.
c. They don't have any specific effect on fluidity.
d. None of the above
5. The association of membrane

a. (They tend to increase the fluidity.)

5. The association of membrane proteins with lipids in the membrane bilayer always
involves:
a. electrostatic interactions
b. hydrophobic interactions
c. all of the above
d. None of the above

c. (all of the above)

6. The nucleotide sequence of DNA is which level of structure?
a. primary
b. secondary
c. tertiary
d. quaternary

a. (primary)

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Biochemistry (Exam 3): Practice Exam Questions
TermDefinition

1. Which of the following lipid molecules possess a different fundamental structural
make-up from the others?
a. Fatty acids
b. Cholesterol
c. Triglycerides
d. Sphingolipids
e. Glycolipids

b. (cholesterol)

2. What does amphipathic mean?
a. having both positive and negative charges
b. having both acid and base properties
c. having both hydrophilic and hydrophobic regions
d. having two stereoisomers

c. (having both hydrophilic and hydrophobic regions)

3. Which of the following four fatty acids has the lowest melting point?
a. CH3CH2CH2CH2CH2COOH
b. CH3CH2CH2CH2CH2CH2CH2CH2CH2COOH
c. CH3CH2CH2CH2CH2CH2CH2COOH
d. CH3CH=CHCH2CH2COOH

d. (CH3CH=CHCH2CH2COOH)

4. How does the presence of cis double bonds in fatty acids affect membrane fluidity?
a. They tend to increase the fluidity.
b. They tend to decrease the fluidity.
c. They don't have any specific effect on fluidity.
d. None of the above
5. The association of membrane

a. (They tend to increase the fluidity.)

5. The association of membrane proteins with lipids in the membrane bilayer always
involves:
a. electrostatic interactions
b. hydrophobic interactions
c. all of the above
d. None of the above

c. (all of the above)

6. The nucleotide sequence of DNA is which level of structure?
a. primary
b. secondary
c. tertiary
d. quaternary

a. (primary)

7. What distinguishes nucleotides from nucleosides?
a. Nucleosides lack the phosphate group.
b. Nucleosides lack the sugar group.
c. Nucleosides lack a nitrogenous base.
d. All of the above
e. None of the above

a. (Nucleosides lack the phosphate group.)

8. The fundamental differences between RNA and DNA are:
a. the organic bases only
b. bases, ribose units, and the phosphodiester linkage
c. bases, ribose units, and the glycosidic bond type
d. bases and the ribose units only
e. None of the above

d. (bases and the ribose units only)

9. Which piece of DNA will have the higher Tm, one with a cytosine plus guanine content
of 30% or one with a cytosine plus guanine content of 50% if both are heated under the
same experimental conditions?
a. 30% cytosine plus guanine will have the higher Tm.
b. 50% cytosine plus guanine will have the higher Tm.
c. Their Tm's will be the same.
d. There's no way to predict for this information.

b. (50% cytosine plus guanine will have the higher Tm.)

12. Epimers are:
a. stereoisomers that differ from each other in their configuration at two or more carbon
atoms.
b. stereoisomers that differ from each other in their configuration at a single carbon
atom.
c. the α and β forms of cyclic sugars.
d. two related compounds, pyran and furan.
e. None of the above.

b. (stereoisomers that differ from each other in their configuration at a single carbon atom.)

14. A steroisomer that is not a mirror image is known as a___________.

diastereomer

15. The axis of a double helix of DNA is twisted by a mechanism known as __________.

supercoiling.

16. Membrane -bound proteins that are embedded in the hydrocarbon chains of the
membrane lipids are called:
a. Conjugated
b. Integral
c. Peripheral
d. Asymmetric
e. None of the above

b. (Integral)

17. Which of the following is true?
a. Membranes are lipid bilayers.
b. Membrane lipids have both hydrophobic and hydrophilic properties.
c. Many membranes are electrically polarized.
d. All of the above.
e. None of the above.

d. (All of the above.)

18. What force(s) stabilize(s) the lipid bilayers?
a. van der Waals interactions
b. electrostatic and hydrogen bonding between the polar heads and surrounding water
c. covalent bonds between the lipid tails
d. covalent bonds between the lipids and membrane proteins
e. a and b

e. (a and b)

19. The degree of membrane fluidity depends on:
a. the percentage of lipids that contain choline.
b. the percentage of glycolipids.
c. the percentage of free fatty acids.
d. the percentage of unsaturated fatty acids.
e. None of the above.

d. (the percentage of unsaturated fatty acids.)

20. Which of the following helps regulate membrane fluidity in animals?
a. protein
b. cholesterol
c. ATP
d. magnesium ion
e. None of the above.

b. (cholesterol)

21. The first stage in the oxidation of foods is:
a. digestion
b. allostery
c. lipidation
d. glycosylation
e. none of the above

a. (digestion)

22. The inactive precursor that can be covalently modified to generate an active protease
is known as a(n):
a. activator
b. cofactor
c. zymogen
d. coenzyme
e. none of the above

c. (zymogen)

23. The second step for an organism to utilize food is to:
a. activate ATP for digestion.
b. hydrolyze the complicated macromolecules for transport.
c. degrade numerous small units to a few simple units.
d. phagocytose the food into the cell.
e. None of the above.

c. (degrade numerous small units to a few simple units.)

24. In order to maintain activity, Pepsin requires:
a. low pH
b. partial denaturation of protein
c. zymogen activation
d. All of the above.
e. None of the above.

d. (All of the above.)