10 Protein Function

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created 10 months ago by Jonathan_Miranda
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1

Which of the following is an example of an antibody?

A) Heat shock proteins

B) Myosin

C) Kinesin

D) Immunoglobulin G

D

2

What are the major functions of proteins? (select all that apply)

A) Structural support

B) Movement

C) storage

D) protection

E) transport

A, B, C, D, E

3

Which of the following is an example of a storage protein?

A) Myoglobin

B) Hemoglobin

C) Myosin

D) Kinesin

E) All the above

A

4

Which of the following statements is NOT true regarding dynein?

A) Dynein converts the chemical energy stored in ATP to mechanical work.

B) Dynein transports cellular cargo

C) Dyneins move along microfilaments.

D) All the above are true

C

5

Which of the following is NOT a function of molecular chaperones?

A) They prevent misfolding in a protein-rich environment of the cytosol.

B) They reverse misfolding of proteins.

C) They degrade mutated cells.

D) They enhance protein folding.

C

6

Why do a large fraction of newly synthesized proteins require assistance from heat shock proteins? (select all that apply)

A) They help transport the newly synthesized proteins.

B) They help prevent the newly synthesized proteins from associating and forming protein aggregates.

C) They protect the newly synthesized proteins from their hydrophilic regions in the cytoplasm.

D) They assist in folding as soon as the polypeptide emerges from the nucleus.

B

7

Which types of cells produce antibodies? (select all that apply)

A) White blood cells

B) B cells

C) A cells

D) Red blood cells

E) C cells

A, B

8

Which of the following statements is NOT a characteristic of enzymes?

A) Changes the outcome of the reaction

B) Highly specific

C) Lowers the activation energy of a reaction

D) They are not altered irreversibly by the reaction

A

9

Which of the following statements are true? (select all that apply)

A) Low ATP produces low rates of glycolysis and oxidative phosphorylation.

B) The use of ATP accelerates glycolysis and the citric acid cycle.

C) Increased levels of NADH and acetyl-CoA inhibit the oxidation of pyruvate to acetyl-CoA.

D) A low [NADH]/[NAD+] ratio inhibits the dehydrogenase reactions of the citric acid cycle.

B, C

10

GTP regulation requires guanine nucleotide exchange factor (GEF) to turn the GTP-binding protein on by (1) and requires GTPase activating protein (GAP) to turn the GTP-binding protein off by (2) .

A) (1) Indirectly adding a phosphate group back to the protein, (2) hydrolyzing GTP to GDP

B) (1) Hydrolyzing GTP to GDP, (2) indirectly adding a phosphate group back to the protein

C) (1) Hydrolyzing GDP to GTP, (2) indirectly adding a phosphate group back to the protein

D) (1) indirectly adding a phosphate group back to the protein, (2) Hydrolyzing GDP to GTP

A