Amino Acids

Question 1

What is a zwitterion?

Answer 1

A molecule with positive and negatively charged groups

Question 2

What is the most naturally occurring amino acid configuration?

Answer 2

L-configuration

Question 3

Why are amino acids amphoteric?

Answer 3

They have both an acid and basic group

Question 4

What groups does an amino acid contain?

Answer 4

Amino group, carboxyl group, H, and a side chain. The α carbon is chiral (with 1 exception)

Question 5

What amino acid does not have a chiral carbon?

Answer 5

Glycine

Question 6

In amino acid chains, when the pH of a solution is lower than the pKa, what state is the H+ in?

Answer 6

H+ is on

Question 7

In Glycine, if pH of solution is 3 and the pKa of the amino group is 2.6 and 7 for the carboxylic acid group, what is the charge?

Answer 7

Amino group is not protonated so has no charge. The carboxylic acid group is protonated so has no charge. The is no charge overall

Question 8

What reaction forms a peptide bond?

Answer 8

A condensation reaction

Question 9

What are the 2 ends of a protein linked by a peptide bond?

Answer 9

N-terminal end and C-terminal end

Question 10

What restricts rotation with a peptide bond?

Answer 10

Double bond characteristics

Question 11

What does the lack of rotation in peptide bonds limit?

Answer 11

The secondary structures that the peptide bond can take