amino acids Flashcards
from alistair question booklet - theme 4
The half-lives of most proteins in the body are on the order of
a. minutes
b. hours
c. days
d. months
e. years
b
The normal protein turnover in an adult is about
a. 1g/day
b. 30g/day
c. 300g/day
d. 600g/day
e. 1500g/day
c
Protein is stored in the body
a. in the liver
b. in skin
c. in adipose tissue
d. in skeletal muscle
e. nowhere
e
The recommended daily intake of protein is about
a. 0g
b. 5g
c. 15g
d. 60g
e. 120g
d
Cortisol
a. decreases protein breakdown
b. increases protein breakdown
c. has no effect on protein breakdown
d. increases protein synthesis
e. decreases amino acid degradation
b
The important cofactor in aminotransferase enzymes is
a. vitamin B12
b. vitamin E
c. pyridoxal phosphate
d. tetrahydrofolate
e. Fe2+
c
The acceptor of the amino group in transamination reactions is usually
a. 2-oxoglutarate
b. glutamate
c. oxaloacetate
d. pyruvate
e. glutamine
a
Deamination to remove the ammonia group can occur for
a. all amino acids
b. all non-essential amino acids
c. glutamate only
d. glutamate and glutamine
e. 2-oxoglutarate
c
The main site of nitrogen metabolism is
a. skeletal muscle
b. kidney
c. gut
d. spleen
e. liver
e
Amino groups from degraded muscle protein are transported in the blood
a. bound to albumin
b. as free NH3 molecules
c. as part of glutamine after combination with glutamate
d. as part of asparagine after combination with aspartate
e. as part of glutamate after combination with 2-oxoglutarate
c
Amino groups from degraded proteins are excreted as
a. urea only
b. uric acid only
c. urea and ammonium ions
d. creatinine and urea
e. urea, uric acid, and creatinine
c
The number of nitrogen atoms in one urea molecule is
a. 0
b. 1
c. 2
d. 3
e. 4
c
The amino acid from which the urea molecule is cleaved is
a. aspartate
b. glutamine
c. glutamate
d. arginine
e. asparagine
d
