Question 1

Which elements are found in the atomic composition of proteins?

Accepted Answer

C, H, O, N, S

Question 2

What type of bond forms between two amino acids during protein synthesis?

Accepted Answer

Peptide bond

Question 3

Which level of protein structure is determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 4

What type of interaction stabilizes the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 5

Which of the following is an example of a protein with quaternary structure?

Accepted Answer

Hemoglobin

Question 6

A mutation changes a single amino acid in hemoglobin from glutamic acid to valine. What is the likely consequence?

Accepted Answer

Distortion of red blood cell shape, leading to sickle cell anemia

Question 7

Which of the following bonds is covalent and only forms between cysteine residues in proteins?

Accepted Answer

Disulfide bond

Question 8

What is the role of molecular chaperones in cells?

Accepted Answer

They assist in the proper folding of proteins

Question 9

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

Accepted Answer

The overall three-dimensional shape formed by interactions among side chains

Question 10

Which interaction is NOT typically involved in stabilizing the tertiary structure of proteins?

Accepted Answer

Phosphodiester bonds

Question 11

If a protein is denatured by heat and chemicals, what happens to its function?

Accepted Answer

It loses its function due to loss of 3D structure

Question 12

Which of the following is true about the primary structure of a protein?

Accepted Answer

It is the linear sequence of amino acids joined by peptide bonds

Question 13

What is the correct formula for the number of possible protein sequences of length $n$ if there are 20 different amino acids?

Accepted Answer

$20^n$

Question 14

Which of the following statements about protein folding is correct?

Accepted Answer

Folding is often facilitated by molecular chaperones

Question 15

Which bond is formed during the dehydration synthesis of two amino acids?

Accepted Answer

Peptide bond

Question 16

Which protein structure level involves the interaction of multiple polypeptide chains?

Accepted Answer

Quaternary structure

Question 17

Which of the following is a direct consequence of a change in the amino acid sequence of a protein?

Accepted Answer

Alteration of the protein's 3D structure and function

Question 18

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

Accepted Answer

Storing genetic information

Question 19

Which of the following interactions is responsible for the formation of alpha helices and beta sheets in proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 20

A protein is found to be nonfunctional due to improper folding. Which cellular component is most likely to assist in correcting this?

Accepted Answer

Molecular chaperones

Protein Structure and Function: Study Notes for General Biology

Study Guide - Practice Questions