Mcq Subject: Biochemistry

Deficiency of purine nucleoside phosphorylase causes

A. Complement deficiency

B. Cellular immunodeficeincy

C. Humoral immunodeficeincy

D. Combined immunodeficeincy

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A histological section of the left ventricle of a deceased 28-year-old male shows classic contraction band necrosis of the myocardium. Biological specimens confirm the presence of cocaine and metabolites. Activity of which of the following enzymes was most likely increased in the patient’s myocardial cells sholy prior to his death?

A. Phosphoenolpyruvate carboxykinase

B. Phosphofructokinase-1

C. Pyruvate dehydrogenase

D. Succinate dehydrogenase

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Protein of muscle which helps in relaxation is

A. Nebulin

B. Titin

C. Desmin

D. Calcineurin

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Fructose intolerance is due to deficiency of ?

A. Aldolase B

B. Fructokinase

C. Triokinase

D. Aldolase A

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Form of vitamim D which is measured in serum ?

A. Cholecalciferol

B. 25 hydroxyvitamin D

C. 1,25 dihydroxyvitamin D

D. 24,25 dihydroxyvitamin D

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Which vitamin required for hydroxylation of proline

A. A

B. D

C. C

D. K

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Which of the following enzyme of TCA cycle is analogous to Pyruvate dehydrogenase complex?

A. Isocitrate dehydrogenase

B. Alpha ketoglutarate dehydrogenase

C. Malate dehydrogenase

D. Succinate dehydrogenase

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What is the major source of extracellular cholesterol for human tissues?

A. Very-low-density lipoproteins (VLDLs)

B. Low-density lipoproteins (LDLs)

C. High-density lipoproteins (HDLs)

D. Albumin

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Insulin inhibits ketogenesis by all except

A. Inhibiting lipolysis

B. Increased esterification of fatty acids

C. Directing acetyl-CoA to TCA cycle

D. Increasing b-oxidation

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Ninhydrin test is used for ?

A. Bile salts

B. Amino acids

C. Nucleic acid

D. Lipids

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