Lesson 3

Question 1

Vocab: Primary Structure

Answer 1

The sequence of amino acids that are held together by covalent bonds

Question 2

Vocab: Quaternary Structure

Answer 2

Interaction between two or more polypeptides

Question 3

Vocab: Secondary Structure

Answer 3

Hydrogen bonds cause the peptide backbone to fold into a repeating pattern, such as the 𝛼-helix and 𝛽-sheet

Question 4

Vocab: Tertiary Structure

Answer 4

Interactions between amino acids that are far apart in the sequence, which generates a three-dimensional structure of the polypeptide

Question 5

HW: The _____ of the amino acid has the greatest influence on the overall structure of a protein.

Answer 5

R Group

Question 6

iClicker: A carbon atom has 4 valence electrons. How many possible bonds can carbon form?

a. 1
b. 2
c. 3
d. 4
e. 6

Answer 6

D

Question 7

iClicker: With which molecule will a non-polar organic molecule 
(such as octane) most likely interact? 
a. Hydrophilic molecule
b. Polar molecule
c. Hydrophobic molecule
d. A and B only
e. none of these

Answer 7

C

Question 8

You have discovered a new virus. To determine the species, you analyze the nucleic acids and come up with the following information: 20% deoxythymidine and 80% Uridine. What can you conclude about this virus?

a. It only uses DNA
b. It only uses RNA
c. It doesn’t use nucleic acid as the genetic information
d. it predominantly uses RNA, but uses some DNA

Answer 8

D

Question 9

iClicker: Based on the below formulas, which statement is NOT true?

A: C_4 H_8 O_4
B: C_60 H_96 N_35 O_78 P_6
C: C_36 H_72 O_36

a. Compound A is a Carbohydrate
b. Compound B is a Polysaccharide
c. Compound C is a polysaccharide
d. Compound C is a carbohydrate
e. Compound B is a nucleic acid

Answer 9

B

Question 10

Hydrophobic exclusion is an odd term as it implies that hydrophobic groups repel each other. But, what is being excluded? Think about what hydrophobic means.

a. Water
b. Charged compounds
c. Polar compounds
d. A and C only
e. All of the above

Answer 10

E