Chapter 1 - AA, Peps And Proteins

Question 1

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

Answer 1

Make flash card deck

Question 2

What AA is not optically active?

Answer 2

Glycine

Question 3

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

Answer 3

R configuration
**L amino acids

Cysteine is S (SSSSysteine)

Question 4

What are the seven nonpolar, nonaromatic AAs?

Answer 4

Glycine

Alanine

Valine

Leucine

Isoleucine

Methionine

Proline

Question 5

Three aromatic AAs

Answer 5

Phenylalanine

Tyrosine

Tryptophan

Question 6

AA with polar side chains (5)

Answer 6

Serine and Thréonine (OH groups)

Asparagine and glutamine (amide)

Cystine (Thiol group)

Question 7

Negatively charged AAs

Answer 7

Aspartic acid and glutamic acid

Question 8

Positively charged AAs

Answer 8

Arginine

Histidine

Lysine

Question 9

1 letter abbreviation for:

Asparagine
 aspartic acid
 glutamic acid
Glutamine 
Phenylalanine 
Tryptophan
Tyrosine

Answer 9

Asparagine: N

aspartic acid: D

glutamic acid: E

Glutamine: Q

Phenylalanine : F

Tryptophan: W

Tyrosine: Y

Question 10

What if pH < pKa

         pH > pKa

         pH = pKa

Answer 10

pH < pKa : protonated

PpH > pKa: deprotonated

= zwitterion

Question 11

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

Answer 11

COOH = 2

NH2 = 9

Question 12

Which AAs have chiral carbons in their side chains?

Answer 12

Threonine and Isoleucine

Question 13

Make AA flashcards

Answer 13

Chicken parmesan