Amino Acids Flashcards Preview

Biochemistry I > Amino Acids > Flashcards

Flashcards in Amino Acids Deck (41)
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1

Proteins are...

Linear heteropolymers of alpha amino acids.

2

Proteins only contain which type of amino acids?

L amino acids.

3

All amino acids are chiral except...

Glycine.

4

Nonpolar, aliphatic R group side chains

R side chain is an alkyl group.

5

Aromatic R group side chains

R side chain is an aromatic group.

6

Polar, uncharged R group side chains

Can form hydrogen bonds (have an oxygen or nitrogen). Cysteine can form disulfide bonds (has a sulfur).

7

Positively charged R groups

Long chains, contain positively charged amino groups. Histidine has N but forms a ring.

8

Negatively charged R groups

Have a deprotonated carboxyl group.

9

What are the essential amino acids?

Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine.

10

What are the conditionally non-essential amino acids?

Arginine, cystine, glutamine, glycine, proline, tyrosine.

11

What are the non-essential amino acids?

Alanine, asparagine, aspartate, glutamate and serine.

12

The carboxylic acid of an amino acid will be protonated at...

An acidic (low) pH. First to deprotonate.

13

The amino group of an amino acid will be deprotonated at...

A basic (high) pH. Last to deprotonate.

14

At a low pH, amino acids are...

Positively charged.

15

At a high pH, amino acids are...

Negatively charged.

16

At the isoelectric point...

The amino acid is least soluble in water and does not migrate in an electric field.

17

Average molecule weight of an amino acid

110

18

How many nucleotides for one amino acid?

3

19

Glycine

Gly
Nonpolar

20

Alanine

Ala
Nonpolar

21

Proline

Pro
Nonpolar

22

Valine

Val
Nonpolar

23

Leucine

Leu
Nonpolar

24

Isoleucine

Ile
Nonpolar

25

Methionine

Met
Nonpolar

26

Phenylalanine

Phe
Aromatic

27

Tyrosine

Try
Aromatic

28

Tryptophan

Trp
Aromatic

29

Serine

Ser
Polar, uncharged

30

Threonine

Thr
Polar, uncharged