Biological Molecules: Proteins

Question 1

Proteins are biological molecules made of _____.

Answer 1

amino acids

Question 2

Which of the following properties of a protein is least likely to be affected by changes in pH?

A. primary structure
C. secondary structure
B. quaternary structure
D. tertiary structure

Answer 2

A. primary structure

Question 3

Polypeptides are chains of amino acids linked together in a specific order. What type of bonds are formed between these amino acids?

Answer 3

peptide bonds

Question 4

The primary structure of protein represents?

Answer 4

linear sequence of amino acids joined by peptide bond

Question 5

What is the function of protein in the human body?

A. To repair tissues
B. To act as enzymes
C. To serve as antibodies
D. All answers are correct.

Answer 5

D. All answers are correct.

Question 6

The conformation, or shape, of a protein determines its function. There are four orders of protein structure: primary, secondary, tertiary, and quaternary. Which of the following statements is accurate regarding
these protein structures?

A. Secondary structures are formed by multiple polypeptide chains.
VALUING
WRAP-UP
B. Proteins in a quaternary structure consist of a simple polypeptide
chain.
C. The two types of primary structure are α (alpha) helices and β(beta)
pleated sheets.
D. Interactions between the R groups in amino acids form tertiary
structure.

Answer 6

D. Interactions between the R groups in amino acids form tertiary
structure.

Question 7

The alpha helix is an example of which of the following structural properties of proteins?

A. primary structure
C. secondary structure
B. quaternary structure
D. tertiary structure

Answer 7

C. secondary structure

Question 8

Which of the following is an example of protein denaturation?

A. Several amino acids are joined together via peptide bonds.
B. A protein binds with a substrate, lowering the activation energy of a
reaction.
C. Amino acids fold into repeating patterns due to hydrogen bonding of
the peptide backbone.
D. A protein is exposed to extremely high heat, causing it to lose its
secondary structure and be left with only its primary structure.

Answer 8

D. A protein is exposed to extremely high heat, causing it to lose its
secondary structure and be left with only its primary structure.

Question 9

Which part of the amino acid gives it uniqueness?
A. amino group
C. side chain
B. carboxyl group
D. phosphate group

Answer 9

C. side chain

Question 10

Which of the following are functions of proteins? Choose two answers.

A. Cell signaling
B. Energy storage
C. Encoding genetic information
D. Catalyzing chemical reactions

Answer 10

A. Cell signaling