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

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
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
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

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

322. In molecular cloning, Blue White screening is used for_______________?
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A. To identify desired chromosomal DNA insert in plasmid vectors

B. To screen for recombinant vectors

C. To detect host DNA in situ

D. To detect gene mutations

324. The action of vitamin K in formation of clotting factor is through__________________?
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A. Golgi complex

B. Endoplasmic reticulum

C. Post translation

D. Post transcription

326. Mutations are due to changes in_________________?
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A. Amino acid sequence of ribonuclease

B. RNA nucleotide sequence

C. Cell walls

D. DNA nucleotide sequence
327. The sugar component of cerebrosides is_____________?
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A. Galactose

B. Fructose

C. None of the above

D. Sucrose

328. The normal value of serum potassium level is____________?
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A. 3.8-5 meq/L

B. 6-7.2 meq/L

C. 2.8-3.8 meq/L

D. 5-5.8 meq/L

331. Who is known for his work on scurvy ?
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A. Fracastorius

B. Edward Jenner

C. James lind

D. John snow

332. NADPH is required for________________?
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A. Fatty acid synthesis

B. Glycolysis

C. Gluconeogenesis

D. Glycogenolysis

333. True about G protein couple receptors is _________________ ?
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A. G proteins bind to hormones on the cell surface

B. G Proteins act as inhibitory and excitatory because of difference in alpha subunit

C. All the three subunits alpha, beta and gamma should bind each other for G protein to act

D. G protein is bound to GTP in resting state

334. HMG-CoA is formed during metabolism of all except______________?
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A. Ketone bodies

B. Leucine

C. Bile acids

D. Cholesterol

335. Quaternary structure of protein is_____________?
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A. The inter relation and arrangement of polypeptides in a protein with more than 2 polypeptide chains

B. Inter relation of amino acids in 2 polypeptide chains

C. Inter relation between amino acids in a single polypeptide chain

D. The arrangement sequence of amino acids in the polypeptide chain

336. Which of the following process in involved in conversion of DNA to RNA___________?
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A. Translocation

B. Conjugation

C. Transcription

D. Transduction

337. A mutation that converts an amino acid codon to a stop codon is a_____________?
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A. Silent mutation

B. Transversion

C. Nonsense mutation

D. Frame shift mutation

338. Ketone bodies are normally synthesized from______________?
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A. Glucose

B. Acetyl-CoA

C. Acetone

D. Glycerol

339. All of the following are true about manifestations of vitamin E deficiency except_____________?
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A. Posterior column abnormalities

B. Cerebellar ataxia

C. Hemolytic anemia

D. Autonomic dysfunctions
341. Rate limiting step in cholesterol synthesis is_______________?
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A. HMG CoA lyase

B. HMG CoA reductase

C. Mevalonate synthetase

D. HMG CoA synthetase

345. A fatty acid that is not synthesized in man is_____________?
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A. Palmitic acid

B. Oleic acid

C. Stearic acid

D. Linoleic acid
346. Argentaffinoma is characterized by excess excretion of_____________?
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A. 5- Hydroxy indole acetate

B. 3- Hydroxy phenyl pyruvate

C. Phenyl acetate

D. Phenyl lactate

348. The reducing equivalent for fatty acid synthesis is derived form____________?
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A. Krebs cycle

B. Urea cycle

C. Glycolysis

D. Pentose phosphate pathway
349. The ketone bodies, which are excreted in diabetic ketoacidosis ?
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A. Acetoacetic acid and oxalocacetic acid

B. Acetoacetic acid and pyruvic acid

C. Acetoacetic acid and beta hydroxyl butyric acid

D. Acetoacetic acid and alpha ketoglutaric acid