Chapter 4: Amino Acids

Question 1

link amino acid residues in a polypeptide

Answer 1

peptide bonds

Question 2

at what pH are amino groups are protonated and the carboxylic acid groups are in theor conjugate base (carboxylate) form

Answer 2

~ 7.4

Question 3

has the smallest possible side chain

Answer 3

glycine

Question 4

Uncharged Polar Side Chains have what groups

Answer 4

Hydroxyl, Amide, or Thiol Groups

Question 5

Charged Polar Side Chains have what charges

Answer 5

Positively or Negatively Charged

Question 6

an amide linkage is known as a what bond

Answer 6

peptide

Question 7

The residue with a free amino group is called

Answer 7

amino terminus or N-terminus

Question 8

The residue with a free carboxylate group is called

Answer 8

carboxyl terminus or C-terminus

Question 9

are molecules that contain one or more polypeptide chains

Answer 9

proteins

Question 10

can exist in both the neutral and
cationic forms in proteins

Answer 10

Histidine

Question 11

The amino acids in proteins all have the what stereochemical configuration

Answer 11

L

Question 11

it has a thiol group that can form a disulfide bond with the same amino acid through the oxidation of the two thiol groups

Answer 11

cysteine

Question 12

helps oxidative compounds that
could potentially damage
cellular structures

Answer 12

Glutathione

Question 13

The pH at which a molecule carries no net electric charge is
known as its

Answer 13

isoelectric point (pI)

Question 14

pK values of the carboxylic acid groups

Answer 14

2.2

Question 15

pK values of the amino groups

Answer 15

9.4

Question 16

what is the biggest protein

Answer 16

tryptophan

Question 17

amino acid with no side chain

Answer 17

glycine

Question 18

what amino acid can be switched

Answer 18

the ones with similar properties

Question 19

what are some amino acids that can’t be switched

Answer 19

tryptophan
cysteine
histidine