Question 1

Which of the following best describes the primary structure of a protein?

Accepted Answer

The unique sequence of amino acids in a polypeptide.

Question 2

A change from glutamic acid to valine in the hemoglobin protein leads to sickle cell anemia. What property of the amino acid side chain is most responsible for this effect?

Accepted Answer

The change from a polar to a nonpolar side chain.

Question 3

Which level of protein structure is directly responsible for the formation of alpha-helices and beta-pleated sheets?

Accepted Answer

Secondary structure

Question 4

What type of bond forms between the carboxyl group of one amino acid and the amino group of another during protein polymerization?

Accepted Answer

Peptide bond

Question 5

Which of the following is NOT a function typically performed by proteins in living cells?

Accepted Answer

Storing genetic information

Question 6

A protein is denatured by heat. What is the most likely consequence?

Accepted Answer

It loses its ability to function normally.

Question 7

Which of the following interactions is NOT typically involved in stabilizing tertiary protein structure?

Accepted Answer

Phosphodiester bonds between nucleotides

Question 8

What is the role of molecular chaperones such as Hsp90 in cells?

Accepted Answer

They facilitate proper protein folding and prevent aggregation.

Question 9

Which of the following statements about prions is correct?

Accepted Answer

Prions are misfolded proteins that can induce normal proteins to misfold.

Question 10

Which of the following best explains why proteins are considered the most versatile macromolecules in life?

Accepted Answer

They have unparalleled diversity in size, shape, and chemical properties due to the variety of amino acid side chains.

Question 11

Which of the following is a direct consequence of the hierarchical nature of protein structure?

Accepted Answer

Primary structure determines secondary, tertiary, and quaternary structures.

Question 12

A protein consists of two identical polypeptide subunits. What is this structure called?

Accepted Answer

Homodimer

Question 13

Which of the following amino acid side chains would most likely be found in the interior of a globular protein?

Accepted Answer

A nonpolar side chain

Question 14

Which of the following is true regarding the directionality of a polypeptide chain?

Accepted Answer

By convention, polypeptide chains are written with the N-terminus on the left.

Question 15

Which of the following equations correctly represents the condensation reaction that forms a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$$

Question 16

Which of the following is a real-world example of how a single amino acid change can radically alter protein function?

Accepted Answer

Sickle cell anemia caused by a change from glutamic acid to valine in hemoglobin

Question 17

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes hold substrates in a precise orientation to make reactions more likely.

Question 18

Which of the following is NOT a requirement for a molecule to be considered the initial spark of life?

Accepted Answer

Ability to form peptide bonds

Question 19

Which of the following best explains why proteins cannot be the sole origin of life despite their catalytic abilities?

Accepted Answer

Proteins do not carry genetic information required for replication and evolution.

Question 20

Which of the following statements about protein folding is correct?

Accepted Answer

Protein folding is regulated and some proteins only complete folding upon binding to specific molecules.

Protein Structure and Function: Chapter 3 Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드