Tag: Biochemistry Multiple Choice Questions

(A) It is smaller than pepsinogen
(B) It is formed by the action of HCl on its precursor
(C) Its optimum pH is 1.0–2.0
(D) It hydrolyses the C-terminal and N-terminal
peptide bonds of proteins

(A) Thyroid hormones
(B) Catecholamines
(C) Melanin
(D) Catecholamines and melanin

(A) Deamination
(B) Dehydrogenation
(C) Decarboxylation
(D) Carboxylation

(A) Taurocholic acid
(B) Creatine
(C) Purines
(D) Pyrimidines

(A) Tyrosine hydroxylase (tyrosinase) is absent or
deficient in melanocytes
(B) Skin is hypopigmented
(C) It results in mental retardation
(D) Eyes are hypopigmented

(A) Phenylalanine cannot be converted into
tyrosine
(B) Urinary excretion of phenylpyruvate and
phenyllactate is increased
(C) It can be controlled by giving a lowphenylalanine
diet
(D) It leads to decreased synthesis of thyroid
hormones, catecholamines and melanin

(A) Histidine carboxylase
(B) Histidine decarboxylase
(C) Histidase
(D) Histidine oxidase

(A) Metabolise cysteine
(B) Convert cystine into cysteine
(C) Incorporate cysteine into proteins
(D) Reabsorb cystine in renal tubules