1261. Key enzyme in urea synthesis is ______.
A. Urease
B. Carbamyl synthetase *
C. Arginase
D. Omithine
1262. Ammonia is detoxified in liver to form .
A. Uric acid
B. Glutamine
C. Creatinine
D. Urea *
1263. A small CA+2 binding protein that modifies the acitivity of many enzymes and other proteins is response to change of Ca+2 concentration is known as ______.
A. Cycline
B. Calmodulin *
C. Collagen
D. Kinesin
1264. Decarboxylation of which of the following amino acids results in formation of a vasodilator?
A. Valine
B. Arginine
C. Histidine *
D. Glutamic acid
1265. A mutation that converts an amino acid codon to a stop codon is a ____.
A. Nonsense mutation *
B. Transversion
C. Silent Mutation
D. Frame shift mutation
1266. Histidine is converted to histamine by ______.
A. Transamination
B. Hydroxylation
C. Decarboxylation *
D. Reduction
1267. Albumin is synthesized by _____.
A. Liver *
B. Kidney
C. Muscle
D. Spleen
1268. Which of the following amino acids is quickly converted to tyrosine ?
A. Arginine
B. Glycine
C. Phenylalanine *
D. Leucine
1269. Synthesis of protein occurs on _____.
A. Mitochondria
B. Poly ribosomes *
C. Nucleus
D. Golgi Bodies
1270. Which of the following is present in the plasma but absent in the serum?
A. Albumin
B. Globulin
C. Lecithin
D. Fibrinogen *