biology MCQs – Page 16

Practise multiple-choice questions from biology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

biology Mcqs
301. The part of chloroplast where CO2 is fixed to manufacture sugar is__________?
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A. Grana

B. Thylakoid

C. Stroma?

D. Outer membrane

302. The food of hydra consists of___________?
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A. Small crustaceans

B. Detritus

C. Humus

D. Dead microscopic animals

303. An insulin molecule consists of _________ polypeptide chains?
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A. 3

B. 1

C. 4

D. 2
304. Secretin inhibits production of__________________?
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A. Gastric juice

B. Bile

C. All of these

D. Pancreatic juice

305. The cells present in testes and secrete testosterone are___________?
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A. Germinal cell

B. Sertoli cells

C. Interstitial cells

D. Spermatocyte

306. Centrioles are composed of ________ triplets of microtubules.
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A. 15

B. 3

C. 9

D. 10

307. The survival of an animal depends upon its ability to take some from its environment____________?
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A. Inorganic molecules

B. Organic molecules

C. Chemicals

D. Hydrocarbons

308. Specific heat of vaporization of water is_______________?
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A. 574 Kcal/kg

B. 774 Kcal/kg

C. 674 Kcal/kg

D. 874 Kcal/kg

309. Which statement correctly describes the transcription of DNA?
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A. It is a semi conservation process

B. It produces mRNA

C. It occurs at surface of ribosomes

D. It produces another DNA molecule

310. For the synthesis of 10g of glucose ______________ of energy is required?
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A. 717.6 Kcal

B. 727 Kcal

C. 737 Kcal

D. 747 Kcal

311. Lock and Key model was proposed by______________?
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A. Koshland

B. Emil Fischer

C. Rudolph Virchow

D. Robin Williams

312. Scurvy and beri beri and caused by the deficiency of___________?
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A. Vitamin C and B

B. Vitamin B and C

C. Vitamin B and D

D. Vitamin A and B

313. In esterification OH comes from_______________?
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A. Alcohol

B. Sugar

C. Water

D. Organic acid

314. A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called_________________?
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A. Binding site

B. Active site

C. Allosteric site

D. Catalytic site

315. Humming bird is an example of________________?
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A. Ectotherm

B. oded animal

C. Endotherm

D. Heterotherm
316. Magnifying power of electron microscope as compared to eye is____________?
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A. 250X

B. 250000X

C. 500000X

D. 500 X

317. Ribosomes + m-RNA?
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A. Polosome

B. Polysome

C. Phlosome

D. None of these

318. Which conjegated molecules play important role in gene expression___________?
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A. Glycolipids

B. Glycoproteins

C. Nucleohistones

D. None of these

319. Enzymes __________________ the activation energy of a chemical reaction?
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A. Increases or decreases depending upon individual enzyme

B. Decreases

C. Increases

D. Does not effect

320. Which structure of protein gives information aboutnumber and sequence of amino acids in it_______________?
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A. Tertiary structure

B. Quaternary structure

C. Primary structure

D. Secondary structure