biochemistry MCQs – Page 6

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

biochemistry Mcqs
251. Precursor of melanin is________________?
comments icon0
A. Tyrosine

B. Phenylalanine

C. Tryptophan

D. Methionine

252. Alkaptonuria, an inherited metabolic disorder of L0tyrosine metabolism is due to lack of_____________?
comments icon0

A. Tyrosine transaminase

B. Tyrosine oxidase

C. Homogentisate oxidase

D. Parahydroxy phenyl pyruvate Hydroxylase

253. Peripheral neuropathy due to deficiency of vitamin is seen with_______________?
comments icon0

A. Pantothenic acid

B. Vit E

C. Vit A

D. Pyridoxine
254. Fat provides ______% of bodys calories?
comments icon0

A. 50%

B. 40%

C. 75%

D. 30%
255. Which is the by product of the urea cycle_______________?
comments icon0

A. Aspartate

B. Succinate

C. Fumarate

D. Ornithine

256. Cell membrane consists of_________________?
comments icon0

A. Lipids only

B. None of the above

C. Lipids and proteins

D. Protein only

257. Creatine is formed metabolically from______________?
comments icon0

A. Phenylalanine

B. Histidine

C. Arginine

D. Tryptophan

258. Aromatic ring is present in_____________?
comments icon0

A. Glycine

B. Phenylalanine, Glycine

C. Arginine

D. Phenylalanine
259. The primary role of chaperones is to help in______________?
comments icon0
A. Protein folding

B. Protein synthesis

C. Protein degradation

D. Protein denaturation

260. Ligant for peroxisome proliferation activating receptor (PPAR) receptors, a group of nuclear hormone receptors that are involved in the regulation of genes related to glucose and lipid metabolism is_____________?
comments icon0
A. Rosiglitgazone

B. Voglibose

C. Repaglinide

D. Exanatide

261. Insulin caused lipogenesis by all except____________?
comments icon0

A. Decreases intracellular cAMP level

B. Increases the transport of glucose in to the cells

C. Inhibits Pyruvate dehydrogenase

D. Increasing acetyl-CoA corboxylase activity

262. Serum creatine kinase-3 (CK-3) is elevated in_______________?
comments icon0

A. Brain tumours

B. Muscular dystrophy

C. Myocardial infarction

D. Alcoholic cirrhosis

263. Which of the organelles contain DNA_________________?
comments icon0

A. Ribsomes

B. Nucleus

C. Nucleolus

D. Golgi apparatus

264. Which of the following is a phospholipid________________?
comments icon0

A. Oleic acid

B. Glycogen

C. Sphingomyelin

D. Prostaglandin

265. One of the following is not an amino acid______________?
comments icon0

A. Glutamic acid

B. Hydroxy proline

C. Choline

D. Glycine

266. The antibacterial substance present in tears which acts by splitting cell wall components is____________?
comments icon0

A. Lysozyme

B. Betalysine

C. Lactoperoxidase

D. Penicillin

267. The following vitamin is important in non-oxidative decarboxylation, transamination and transsulfuration reactions_____________?
comments icon0

A. Thiamine

B. Pantothenic acid

C. Riboflavin

D. Pyridoxine
268. Collagen is rich in_____________?
comments icon0

A. Glutamate and proline

B. Proline and glycine

C. Alanine and glycine

D. Glutamate and glycine

269. Which is the poorest source of calcium among the following______________?
comments icon0

A. Egg yolk

B. Rice

C. Human milk

D. Cows milk

270. Unsaturated fatty acids are converted to______________?
comments icon0

A. Cholesterol

B. Saturated fatty acid

C. Prostaglandins

D. Cell membrane lipid

271. The most important role of cholesterol is_____________?
comments icon0
A. It is a component of cell membrane

B. It stores up energy

C. None of the above

D. It is a precursor of polyunsaturated fatty acids

272. Following is non-essential amino acid_______________?
comments icon0
A. Proline

B. Phenylalanine

C. Tryptophan

D. Threonine

273. The substance essential for transfter of fatty acids across mitochondrial membrance_____________?
comments icon0
A. Carnitine

B. Creatine

C. Creatinine

D. Coenzyme A

274. Generation of free radicals occurs by all of the following mechanism EXCEPT_____________?
comments icon0

A. Normal metabolism

B. All of the above

C. Oxygen toxicity

D. Reperfusion after ischemic injury
275. FIGLU excretion test is to estimate deficiency of_______________?
comments icon0
A. Vitamin folic acid

B. Vitamin B6

C. Niacin

D. Vitamin K

276. Normal level of serum phosphorous is_____________?
comments icon0

A. 1-2 mgm%

B. 7-9 mgm%

C. 40-50 mgm%

D. 2.5 4.5 mgm%
277. Genes are_____________?
comments icon0

A. Ribonucleic acid

B. Lipoproteins

C. Chromo proteins

D. Deoxy ribonucleic acid
278. Niacin & riboflavin help in_____________?
comments icon0

A. Methyl group transfer

B. Amine group transfer

C. Transamination reaction

D. Redox reactions
279. False statement about haemoglobin structure________________?
comments icon0

A. Hb structurally similar to myoglobin

B. Iron is present in ferrous state

C. Ferrous ions are in porphyrin rings

D. Hb has 2 polypeptide chains
280. The daily requirement of protein for the adults is_________________?
comments icon0
A. 60 gms

B. 120 gms

C. 6 gms

D. 250 gms

281. Iron is complexed in haemoglobin to_______________?
comments icon0

A. Valine

B. Leucine

C. Isoleucine

D. Histidine
282. Cereals are deficient in_____________?
comments icon0
A. Vitamin C

B. Vitamin B complex

C. Iron

D. Calcium

283. Which of the following amino acid is involved in gluconeogenesis______________?
comments icon0

A. Valine

B. Glycine

C. Cysteline

D. All of the above
284. Saponification means hydrolysis of fats by________________?
comments icon0
A. Alkali

B. Enzymes

C. Water

D. Acid

285. Which vitamin is related to a co-factor in glycine metabolism is______________?
comments icon0
A. Folic acid

B. Vit E

C. Cobalamine

D. Thiamine

286. All of the following are globular proteins except_______________?
comments icon0
A. Myosin

B. Albumin

C. Prolamines

D. Globulin

287. The process of transfer of information from the RNA to the proteins is called______________?
comments icon0

A. Mutation

B. Conjugation

C. Translation

D. Transcription

288. Tryptophan load test helps in the evaluation of deficiency of the vitamin______________?
comments icon0

A. Niacinamide

B. Folic acid

C. Cyano cobolamine

D. Pyridoxine
289. Which of the following is used in recombinant DNA technology ?
comments icon0

A. PCR

B. None of these

C. Reverse transcriptase FISH

D. Restriction endonucleases
290. Ferritin an inactive form of iron is stored in_____________?
comments icon0

A. All of the above

B. Gut

C. Liver

D. Spleen

291. Which of the following are the sources of Vit C_________________?
comments icon0

A. Apple

B. Fresh green vegetables

C. Citrus fruits

D. Both B and C
292. ALbumin is synthesized by_____________?
comments icon0

A. Muscle

B. Liver

C. Kidney

D. Spleen

293. Both Vitamin K and C are involved in______________?
comments icon0

A. The microsomal hydroxylation reactions

B. The synthesis of clotting factors

C. Post translational modifications

D. Antioxidant mechanisms

294. If bile acid recycling time is short, then bile salt reservoir pool will be______________?
comments icon0

A. Has no effect

B. Uchanged

C. Decreased

D. Increased

295. Which of the following is not a post transcriptional modification of RNA ?
comments icon0
A. Glycosylation

B. Splicing

C. 3? polyadenylation

D. 5? capping

296. The main function of mitochondria is______________?
comments icon0

A. Protein synthesis

B. Electron transfer

C. Oxidation

D. Fat synthesis

297. Heme is converted to bilirubin mainly in_____________?
comments icon0
A. Spleen

B. Liver

C. Kidney

D. Bone marrow

298. Tocopherol is associated with____________?
comments icon0

A. Vitamin K

B. Vitamin D

C. Vitamin A

D. Vitamin E
299. The main function of HDL is____________?
comments icon0

A. Transport cholesterol from liver to peripheral tissues

B. Esterification with PUFA

C. Both of the above

D. None of the above
300. Which one of the following amino acids is purely ketogenic ?
comments icon0

A. Proline

B. Isoleucine

C. Leucine

D. Phenylalanine