Amino Acids

Question 1

Group 1

Answer 1

Alanine(ALA) Valine(VAL) Leucine(LEU) Isoleucine(ILE) Methionine(MET) Proline(PRO) Phenylalanine(Phe) Tryptophan(Try)

Question 2

Group 2

Answer 2

Glycine(GLY) Cysteine (CYS) Asparagine (ASN) Glutamine (GLN) Tyrosine (TYR) Serine (SER) Threonine (THR)

Question 3

Group 3

Answer 3

Aspartic Acid (ASP) Glutamic Acid (GLU)

Question 4

Group 4

Answer 4

Lysine (LYS) Arganine (ARG) Histidine (HIS)

Question 5

Alanine

Answer 5

.

Question 6

Valine

Answer 6

.

Question 7

Leucine

Answer 7

.

Question 8

Isoleucine

Answer 8

.

Question 9

Methionine

Answer 9

.

Question 10

Proline

Answer 10

.

Question 11

Phenylalanine

Answer 11

.

Question 12

Tryptophan

Answer 12

.

Question 13

Glycine

Answer 13

.

Question 14

Cysteine

Answer 14

.

Question 15

Asparagine

Answer 15

.

Question 16

Glutamine

Answer 16

.

Question 17

Tyrosine

Answer 17

.

Question 18

Serine

Answer 18

.

Question 19

Threonine

Answer 19

.

Question 20

Aspartic acid

Answer 20

.

Question 21

Glutamic acid

Answer 21

.

Question 22

Lysine

Answer 22

.

Question 23

Arganine

Answer 23

.

Question 24

Histidine

Answer 24

.

Question 25

titration Curve

Answer 25

Question 26

Expain titration Curve

Answer 26

• Shows stages of dissociation- loss of H+ from acidic Carboxyl group at low pH and loss of H+ from basic group at high pH
• Shows ionic species predominating at key points in the curve
• pKa vaue for each dissosiable group dettermined- extrapolating midpoint of each buffering region
• pK1 and pK2 indicate regions of greatest buffering power
• The isoelectric point is between two points of strongest buffering capacity- amino acid behaves as neutral salt and is in its zwitterion form- net charge of zero

Question 27

how do you calculate the isoelectric point?

Answer 27

• PI= 1/2 pK1 + pK2
• K1 and K2 are dissociation constants of carboxyl and amino groups respectively