Question 1

Which of the following best describes the general structure of an amino acid?

Accepted Answer

A central carbon atom bonded to an amino group, a carboxyl group, a hydrogen atom, and a variable R group.

Question 2

Which part of the amino acid determines its chemical properties and interactions?

Accepted Answer

The R group (side chain)

Question 3

Which type of side chain would most likely participate in van der Waals interactions within a protein?

Accepted Answer

Nonpolar side chains

Question 4

Which of the following correctly matches the protein structure level with its description?

Accepted Answer

Primary structure: sequence of amino acids linked by peptide bonds

Question 5

Which of the following bonds is responsible for stabilizing the secondary structure of proteins?

Accepted Answer

Hydrogen bonds between backbone atoms

Question 6

A mutation changes a polar amino acid in the active site of an enzyme to a nonpolar amino acid. Which property of the enzyme is most likely to be affected?

Accepted Answer

Its ability to interact with water and substrates

Question 7

Which of the following is a function of chaperone proteins?

Accepted Answer

Assisting in the proper folding of other proteins

Question 8

Which of the following is NOT a way that a protein may become denatured?

Accepted Answer

Formation of peptide bonds

Question 9

Which type of interaction is most important for stabilizing the tertiary structure of a protein?

Accepted Answer

Interactions between R groups, including hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges

Question 10

Which of the following best describes a peptide bond?

Accepted Answer

A covalent bond formed between the carboxyl group of one amino acid and the amino group of another, releasing water

Question 11

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

Accepted Answer

Hemoglobin, which consists of multiple polypeptide subunits

Question 12

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

Accepted Answer

Storing genetic information

Question 13

Which of the following best describes the difference between a polypeptide and a protein?

Accepted Answer

A polypeptide is a single chain of amino acids, while a protein is one or more polypeptides folded into a functional shape.

Question 14

Which of the following amino acid side chains would most likely form a salt bridge in a protein's tertiary structure?

Accepted Answer

An acidic side chain and a basic side chain

Question 15

During dehydration synthesis, which molecule is released when two amino acids are joined?

Accepted Answer

Water ($H_2O$)

Question 16

Which secondary structure is stabilized by hydrogen bonds between every fourth amino acid in the backbone?

Accepted Answer

$\alpha$ helix

Question 17

Which of the following is most likely to occur if a protein is misfolded and not corrected by chaperone proteins?

Accepted Answer

The protein may aggregate and cause cellular dysfunction or disease.

Question 18

Which of the following best explains why proteins can have such diverse functions in cells?

Accepted Answer

The variety of amino acid side chains allows proteins to fold into many different shapes and interact with a wide range of molecules.

Question 19

Which of the following is a correct sequence of protein structure formation from primary to quaternary?

Accepted Answer

Amino acid sequence $\rightarrow$ local folding ($\alpha$ helix/$\beta$ sheet) $\rightarrow$ 3D folding $\rightarrow$ assembly of multiple polypeptides

Protein Structure and Function: Study Notes for General Biology

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