Chapter 1 - AA, Peps And Proteins Flashcards Preview

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Flashcards in Chapter 1 - AA, Peps And Proteins Deck (13):
1

Memorize 20 amino acids, three letter abbrev, one letter, and general type

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2

What AA is not optically active?

Glycine

3

What is the absolute configuration of all chiral AAs? What is the one exception?

R configuration
**L amino acids

Cysteine is S (SSSSysteine)

4

What are the seven nonpolar, nonaromatic AAs?

Glycine

Alanine

Valine

Leucine

Isoleucine

Methionine

Proline


5

Three aromatic AAs

Phenylalanine

Tyrosine

Tryptophan

6

AA with polar side chains (5)

Serine and Thréonine (OH groups)

Asparagine and glutamine (amide)

Cystine (Thiol group)

7

Negatively charged AAs

Aspartic acid and glutamic acid

8

Positively charged AAs

Arginine

Histidine

Lysine

9

1 letter abbreviation for:

Asparagine
aspartic acid
glutamic acid
Glutamine
Phenylalanine
Tryptophan
Tyrosine

Asparagine: N

aspartic acid: D

glutamic acid: E

Glutamine: Q

Phenylalanine : F

Tryptophan: W

Tyrosine: Y

10

What if pH < pKa

pH > pKa

pH = pKa

pH < pKa : protonated

PpH > pKa: deprotonated

= zwitterion

11

What are the pKa values for the carboxyl group and amino groups respectively?

COOH = 2

NH2 = 9

12

Which AAs have chiral carbons in their side chains?

Threonine and Isoleucine

13

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