biochemistry MCQs – Page 16

Practise focused biochemistry questions with marked answers for exam preparation and subject revision.

biochemistry Mcqs

301. Most of vitamin B12 in the body is stored as_____________?
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A. Hydroxy B12

B. Methyl B12

C. None of the above

D. Cyano cobalamine

302. Endogenous triglycerides in plasma is maximally bound to________________?
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A. HDL

B. Chylomicrons

C. LDL

D. VLDL

303. The following is not a phospholipid______________?
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A. Cephalin

B. Cerebroside

C. Lecithin

D. Sphingomyelin

304. Avidin influences which of the following vitamins ?
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A. Phylloquinone

B. Biotin

C. Thiamine

D. Niacin

305. Vitamin B12 is_______________?
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A. Extrinsic factor of castle

B. Intrinsic factor of castle

C. A fat soluble vitamin

D. Cyano cobalamine

306. Digestion of proteins is initiated by________________?
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A. Amylase

B. Pepsin

C. Sucrase

D. Chymotrypsin

307. The lipoprotein particles that have the highest percentage concentration of cholesterol is_______________?
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A. LDL (Low density lipoprotein)

B. HDL (High density lipoprotein)

C. VLDL (Very low density lipoprotein)

D. Chylomicron

308. Deficiency of vitamin C causes the following except_______________?
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A. Defective collagen synthesis

B. Subcutaneous & other hemorrhage

C. Pigeon chest

D. Soft swollen gums

309. Transport form of iron is______________?
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A. Transferrin

B. Lactoferrin

C. Apoferritin

D. Ferritin

310. Nonsense codons bring about__________________?
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A. Initiation of protein synthesis

B. Elongation of polypeptide chain

C. Pre-translational modification of protein

D. Termination of protein synthesis

311. Decarboxylation of which of the following amino acids results in formation of a vasodilator ?
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A. Arginine

B. Glutamic acid

C. Histidine

D. Valine

312. Denaturation of double stranded DNA involves_______________?
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A. It gets broken down to nucleotides

B. It becomes double stranded irreversibly

C. It becomes single stranded irreversibly

D. It becomes single stranded reversibly

313. The fuel value of fat is____________?
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A. 7

B. 4

C. 5

D. 9

314. Amino acids excreted in the urine in cystinosis______________?
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A. Cystine

B. All of the above

C. Ornithine

D. Arginine

E. Lysine

315. Proteins are linear polymers of amino acids, They fold into compact structures Sometimes these folded structures associate to form homo or hetero dimers Which one of the following refers to this associated form ?
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A. Denatured state

B. Quaternary structure

C. Precipitation

D. Molecular aggregation

316. In human body which of the following trace element is next to iron_______________?
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A. Zn++

B. Cu++

C. Ca++

D. Selenium

317. Unwinding of DNA is done by____________?
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A. Ligase

B. DNAse

C. Topo isomerase

D. Reverse transcriptase

318. All are true about glutathione except ?
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A. It converts hemoglobin to methemoglobin

B. It is a tripetide

C. It scavenges free radicals and superoxide ions

D. It conjugates xenobiotics

319. Normal serum calcium level is_______________?
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A. 19-21 mg/dl

B. 9-11 mg/dl

C. 20-30 mg/dl

D. 4-6 mg/dl

320. Codons are present on_____________?
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A. DNA

B. m-RNA

C. t-RNA

D. Ribosomal RNA

Showing 301 to 320 of 448 mcqs