[RECALLS] Prelims - Amino acids (by Edwin Olavides)

Question 1

Characteristic of amino acids:

Answer 1

Nucleus of amino acids is the alpha carbon

Question 2

Amino acid is asymmetric in what:

Answer 2

Chiral except for glycine

Question 3

What is the structure of amino acid?

Answer 3

Amphoteric

Question 4

If pH>pI, what is the net charge?

Answer 4

Net charge is positive

Question 5

Amide linkages from condensation of a-carboxyl group of one amino acid with a-amino group of another amino acid.

Answer 5

Peptide bond

Question 6

Hydrophobic groups:

Answer 6

“AVIL”

Alanine
Valine
Isoleucine
Leucine

Question 7

Aliphatic groups:

Answer 7

"GAVIL"
Glycine
Alanine
Valine
Isoleucine
Leucine

Question 8

Cyclic

Answer 8

Proline

Question 9

Aromatic groups:

Answer 9

Phenylalanine
Tyrosine
Tryptophan
Histidine

Question 10

Hydroxy-containing:

Answer 10

Serine
Threonin
Tyrosine

Question 11

Sulfur-Conataining

Answer 11

Cysteine

Methionine

Question 12

Basic

Answer 12

Histidine
Lysine
Arginine (HKR)

Question 13

Acidic and their amides

Answer 13

Asartic acid
Glutamic acid
Asparagine
Glutamine (DENQ)

Question 14

Valine differs from threonine by:

Answer 14

replacement of the hydroxyl group with a methyl substituent


Question 15

Less hydrophobic in aliphatic groups

Answer 15

Glycine

Question 16

Aromatic amino acids

Answer 16

FYWH

Question 17

Basin side chain

Answer 17

Histidine