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The 20 Amino Acids
Information about each of the 20 A.A.s
21
Chemistry
Undergraduate 4
09/03/2009

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Cards

Term
Glycine
Definition

Gly

G

Not Essential

Hydrophobic

Term
Alanine
Definition

Ala

A

Not essential

Hydrophobic

Term
Valine
Definition

Val

V

Essential

Hydrophobic

Term
Leucine
Definition

Leu

L

Essential

Hydrophobic

Term
Isoleucine
Definition

Ile

I

Essential

Hydrophobic

Term
What is the difference between an essential and a nonessential amino acid?
Definition
Both essential and nonessential amino acids are required for healthy growth and development. However, humans cannot manufacture any of the 9 essential amino acids, which must be obtained from our diet. We can manufacture the 11 nonessential amino acids.
Term
Methionine
Definition

Met

M

Essential

Hydrophobic

Term
Proline
Definition

Pro

P

Not essential

Hydrophobic

Term
Serine
Definition

Ser

S

Not essential

Polar uncharged

Term
Threonine
Definition

Thr

T

Essential

Polar uncharged

Term
Asparagine
Definition

Asn

N

Not essential

Polar uncharged

Term
Glutamine
Definition

Gln

Q

Not essential

Polar uncharged

Term
Cysteine
Definition

Cys

C

Not essential

Polar uncharged

Term
Phenylalanine
Definition

Phe

F

Essential

Hydrophobic aromatic

Term
Tyrosine
Definition

Tyr

Y

Not essential

Hydrophobic aromatic

Term
Tryptophan
Definition

Trp

W

Essential

Hydrophobic aromatic

Term
Lysine
Definition

Lys

K

Essential

Polar charged

Term
Arginine
Definition

Arg

R

Not essential

Polar charged

Term
Histidine
Definition

His

H

Not essential

Polar charged

Term
Aspartate (Aspartic Acid)
Definition

Asp

D

Not essential

Polar charged

Term
Glutamate (Glutamic Acid)
Definition

Glu

E

Not essential

Polar charged

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