Catabolism of Carbon Skeleton of AA

Question 1

How many amino acids are
(1) glycogenic
(2) ketogenic
(3) both glycogenic and ketogenic

Memorize

Answer 1

(1) glucogenic AA - 13
(2) ketogenic AA - 2
(3) Both - 4

Question 2

What AA are both ketogenic and glucogenic

Answer 2

(1) isoleucine - ile
(2) phenylalanine - phe
(3) tryptophan - trp
(4) tyrosine - tyr

Question 3

Ketogenic AAs

Answer 3

(1) leucine - leu
(2) lysine - lys

Question 4

Carbon Skeleton Pathway

Memorize

Answer 4

Question 5

AA that do not undergo transamination before catabolism of their carbon skeletons

Answer 5

(1) proline
(2) hydroxyproline
(3) threonine
(4) lysine

Question 6

Glucogenic AA that are transaminated to:
(1) oxaloacetate
(2) alphaketoglutarate
(3) succinyl-CoA
(4) fumarate
(5) pyruvate

Answer 6

(1) apartate & asparagine
(2) glutamate, arginine, glutamine, histidine, proline
(3) isoleucine, methionine, threonine, valine
(4) phenylalanine & tyrosine
(5) alanine, glycine, cysteine, serine, tryptophan, threonine

Question 7

In general transamination reactions, the AA reacts with (1) to produce the corresponding keto-acid and (2)

(1) as the reactants receives the amino group and becomes (2)

Answer 7

(1) pyruvate
(2) alanine