Question 1

Which amino acids contain sulfur in their side chains?

Accepted Answer

cysteine, methionine

Question 2

Which protein is responsible for storing iron in the liver?

Accepted Answer

ferritin

Question 3

Which protein stores $$O_2 in $$tissues?

Accepted Answer

myoglobin

Question 4

Which protein carries $$O_2 in $$the bloodstream?

Accepted Answer

hemoglobin

Question 5

What is the function of myosin in the human body?

Accepted Answer

controls muscle contractions

Question 6

Which is the simplest amino acid?

Accepted Answer

glycine

Question 7

How many amino acids occur naturally in proteins?

Accepted Answer

20

Question 8

What is the charge on a zwitterion?

Accepted Answer

neutral

Question 9

What is the charge on an amino acid at a pH below its pI?

Accepted Answer

positive

Question 10

Refer to the structures provided. Which structure represents the amino acid leucine at pH 12?

Accepted Answer

Third image

Question 11

Which of the following can denature a protein?

Accepted Answer

All of these can denature a protein.

Question 12

How is a dipeptide formed?

Accepted Answer

The –NH3+ group of one amino acid forms an amide bond with the carboxylate (–COO–) of another amino acid, and the elements of H2O are removed.

Question 13

How many different dipeptides can be formed when one valine reacts with one glycine?

Accepted Answer

2

Question 14

What is the strongest type of interaction between two cysteine amino acid side chains in a protein?

Accepted Answer

disulfide bond

Question 15

What type of intermolecular forces exist between the side chains of isoleucine and valine?

Accepted Answer

London dispersion forces

Question 16

What type of intermolecular forces exist between the side chains of serine and asparagine?

Accepted Answer

hydrogen bond

Question 17

What type of intermolecular forces exist between the side chains of glutamic acid and lysine?

Accepted Answer

electrostatic attraction

Question 18

Denaturation of a protein results in the loss of its native conformation and its biological activity. Which statement best describes what happens to a protein when it is denatured?

Accepted Answer

Secondary, tertiary, and quaternary levels of structure are disrupted.

Question 19

About one half of the 223 amino acid residues in the enzyme trypsin are hydrophobic. Where in the tertiary structure of this globular protein are these residues most likely to be found?

Accepted Answer

in the interior of the folded protein

Amino Acid and Protein Structure Study Guide

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