Question 1

Which part of an amino acid determines its unique chemical properties and interactions within a protein?

Accepted Answer

The R group (side chain)

Question 2

A mutation changes a nonpolar amino acid in the core of a protein to a charged amino acid. What is the most likely effect on the protein’s tertiary structure?

Accepted Answer

It may disrupt hydrophobic interactions, potentially causing misfolding.

Question 3

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

Accepted Answer

Primary structure

Question 4

What type of bond is primarily responsible for stabilizing the secondary structure of proteins, such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds

Question 5

Which of the following best describes the relationship between protein structure and function?

Accepted Answer

Structure determines function; misfolded proteins often lose their function.

Question 6

A patient with Alzheimer’s disease has misfolded amyloid proteins in the brain. Which level of protein structure is most likely disrupted in this disease?

Accepted Answer

Secondary and tertiary structure

Question 7

Which equation represents the formation of a peptide bond between two amino acids?

Accepted Answer

$$\mathrm{R_1${-}CH(NH_2$){-}COOH} + \mathrm{R_2${-}CH(NH_2$){-}COOH} \rightarrow \mathrm{R_1${-}CH(NH_2$){-}CO{-}NH{-}CH(R_2$){-}COOH} + \mathrm{H_2O}$$

Question 8

Which of the following proteins is responsible for transporting oxygen in the blood?

Accepted Answer

Hemoglobin

Question 9

If a protein loses its quaternary structure but retains its tertiary structure, which of the following is most likely true?

Accepted Answer

The protein is composed of a single polypeptide chain.

Question 10

Which type of amino acid side chain would most likely be found on the exterior of a protein embedded in the cell membrane?

Accepted Answer

Nonpolar side chains

Question 11

A protein is exposed to high heat, causing disruption of hydrogen bonds but not peptide bonds. Which levels of structure are most affected?

Accepted Answer

Secondary and tertiary structure

Question 12

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

Accepted Answer

Storing genetic information

Question 13

Which of the following amino acids has a basic side chain?

Accepted Answer

Lysine

Question 14

A protein’s function is lost after a single amino acid substitution. Which concept does this best illustrate?

Accepted Answer

Primary structure is critical for proper folding and function.

Question 15

Which of the following diseases is associated with misfolded proteins?

Accepted Answer

Type II Diabetes

Question 16

Which protein type is responsible for movement within cells, such as contraction of muscle fibers?

Accepted Answer

Motor proteins (e.g., actin and myosin)

Question 17

Which of the following best explains why proteins are so structurally diverse?

Accepted Answer

The sequence and chemical properties of 20 different amino acids allow for many combinations and interactions.

Question 18

Which of the following is an example of a protein acting as a receptor?

Accepted Answer

A protein embedded in the cell membrane that binds signaling molecules

Question 19

Which of the following statements about essential amino acids is correct?

Accepted Answer

They must be obtained from the diet because the body cannot synthesize them.

Question 20

A protein is composed of four polypeptide chains. Which level of structure does this represent?

Accepted Answer

Quaternary structure

Protein Structure and Function: Study Notes for General Biology

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