Amino Acids

Question 1

Glycine

Answer 1

Nonpolar, hydrophobic

Question 2

Serine

Answer 2

Polar, neutral

Question 3

Aspartic acid

Answer 3

Polar, acidic

Question 4

Histidine

Answer 4

Polar, basic, can donate or accept a proton at physiological pH

Question 5

Alanine

Answer 5

Nonpolar, hydrophobic

Question 6

Threonine

Answer 6

Polar, neutral, essential

Question 7

Glutamic acid

Answer 7

Polar, acidic

Question 8

Arginine

Answer 8

Polar, basic

Question 9

Valine

Answer 9

Nonpolar, hydrophobic, essential

Question 10

Aspargine

Answer 10

Polar, neutral

Question 11

Aspartate

Answer 11

Aspartic acid without the H+

Question 12

Lysine

Answer 12

Polar, basic, essential

Question 13

Which polar, basic amino acid is essential?

Answer 13

Lysine

Question 14

Methionine

Answer 14

Nonpolar, hydrophobic, essential, thioether

Question 15

Glutamine

Answer 15

Polar, neutral

Question 16

Glutamate

Answer 16

Glutamic acid without the H+

Question 17

Which amino acid can donate/accept a proton at physiological pH?

Answer 17

Histidine

Question 18

Leucine

Answer 18

Nonpolar, hydrophobic, essential

Question 19

Cysteine

Answer 19

Polar, neutral, thiol/sulfhydryl

Question 20

Which amino acid is a thioether?

Answer 20

Methionine

Question 21

Isoleucine

Answer 21

Nonpolar, hydrophobic, essential

Question 22

Tyrosine

Answer 22

Polar, neutral

Question 23

Which amino acid is a thiol/sulfhydryl?

Answer 23

Cysteine

Question 24

Proline

Answer 24

Nonpolar, hydrophobic

Question 25

Phenylalanine

Answer 25

Nonpolar, hydrophobic

Question 26

Tryptophan

Answer 26

Nonpolar, hydrophobic, essential

Question 27

Which two amino acids have sulfur?

Answer 27

Methionine & Cysteine

Question 28

Name the 8 essential amino acids.

Answer 28

1. Valine 2. Methionine 3. Leucine 4. Isoleucine 5. Phenylalanine 6. Tryptophan 7. Threonine 8. Lysine

Question 29

Which amino acid (residue) never appears within an alpha-helix?

Answer 29

Proline