Question 891 Tryptophan could be considered as precursor of? A) Melanotonin B) Thyroid hormones C) Melanin D) Epinephrine No Details
Question 892 In carcinoid syndrome the argentaffin tissue of the abdominal cavity overproduce? A) Serotonin B) Histamine C) Tryptamine D) Tyrosine No Details
Question 893 The 2 nitrogen atoms in urea are contributed by? A) Ammonia and glutamate B) Glutamine and glutamate C) Ammonia and aspartate D) Ammonia and alanine No Details
Question 894 A compound serving a link between citric acid cycle and urea cycle is? A) Malate B) Citrate C) Succinate D) Fumarate No Details
Question 895 Transfer of the carbamoyl moiety of carbamoyl phosphate to ornithine is catalysed by a liver mitochondrial enzyme? A) Carbamoyl phosphate synthetase B) Ornithine transcarbamoylase C) N-acetyl glutamate synthetase D) N-acetyl glutamate hydrolase No Details
Question 896 Control of urea cycle involves the enzyme? A) Carbamoyl phosphate synthetase B) Ornithine transcarbamoylase C) Argininosuccinase D) Arginase No Details
Question 897 The enzyme carbamoyl phosphate synthetase requires? A) Mg++ B) Ca++ C) Na+ D) K+ No Details
Question 898 In urea synthesis, the amino acid functioning solely as an enzyme activator? A) N-acetyl glutamate B) Ornithine C) Citrulline D) Arginine No Details
Question 900 The enzymes of urea synthesis are found in? A) Mitochondria only B) Cytosol only C) Both mitochondria and cytosol D) Nucleus No Details