Amino Acid Single Letter Code

Question 1

Gly

Answer 1

Glycine

hydrophobic (no polar group)

Question 2

Ala

Answer 2

Alanine

hydrophobic (no polar group)

Question 2

Val

Answer 2

Valine

hydrophobic (no polar group)

Question 3

Phe

Answer 3

Phenylalanine

hydrophobic (no polar group)

Question 4

Pro

Answer 4

Proline

hydrophobic (no polar group)

Question 5

Leu

Answer 5

Leucine

hydrophobic (no polar group)

Question 6

Arg

Answer 6

Arginine

hydrophilic - (can form H bonds with H2O)

pKa = 12.5, so + charge in normal cell conditions

Question 7

Asp

Answer 7

Aspartic Acid

hyrdophilic - (can form H bonds with H2O)

pKa = 3.86, so - charge at normal cell conditions

Question 8

Glu

Answer 8

Glutamic Acid

hydrophilic - (can form H bonds with H2O)

pKa = 4.25, so - charge at normal cell conditions

Question 9

Ser

Answer 9

Serine

hydrophilic - (can form H bonds with H2O)

Question 10

Thr

Answer 10

Threonine

hydrophilic - (can form H bonds with H2O)

Question 11

Cys

Answer 11

Cysteine

hydrophilic - (can form H bonds with H2O)

pKa = 8.3, so + charge in normal cell conditions

Question 12

Asn

Answer 12

Asparagine

hydrophilic - (can form H bonds with H2O)

Question 13

Gln

Answer 13

Glutamine

hydrophilic - (can form H bonds with H2O)

Question 14

His

Answer 14

Histidine

hydrophilic - (can form H bonds with H2O)

sometimes positively charged, sometimes negative

Question 15

Lys

Answer 15

Lysine

amphipathic

pKa = 10.5, so + charge in normal cell conditions

Question 16

Tyr

Answer 16

Tyrosine

amphipathic

pKa = 10.1, so + charge in normal cell conditions

Question 17

Met

Answer 17

Methionine

amphipathic

Question 18

Trp

Answer 18

Tryptophan

amphipathic

Question 19

Ile

Answer 19

isoleucine

hydrophobic (no polar group)