biology MCQs – Page 17

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 Review each marked answer and report any item that may be outdated or unclear.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
321. Reactions in which simple substances are combined to form complex substances are called_____________?
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A. Anabolic reactions

B. Catabolic reactions

C. Metabolic reactions

D. None of these

322. Variety among amino acids is produced due to_____________?
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A. All of these

B. R group

C. COOH group

D. NH2 group

323. There are mainly __________ types of tRNA?
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A. 15

B. 20

C. 170

D. 25

324. Membranes of the grane are sites where?
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A. Food is stored

B. CO2 is stored.

C. Oxygen is stored

D. Sunlight is trapped
325. An example of codominance is______________?
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A. AB blood group

B. B blood group

C. O blood group

D. A blood group

326. Which of the following combination is an example of self replicating organelles?
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A. Mitochondria Nucleus

B. Mitochondria Vacuole

C. Mitochondria Ribosomes

D. Mitochondria Chloroplast?
327. Biological molecules (proteins) which catalyze a biochemical reaction and remain unchanged after completion of reaction are called_____________________?
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A. Activator

B. Enzymes

C. Cofactor

D. Coenzymes

328. Proteins and lipids are converted into glycolipids and glycoproteins by adding carbohydrates by___________?
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A. Cytoplasm

B. Golgi apparatus

C. Ribosomes

D. Endoplasmic reticulum

329. According to Lamarch evolution occurred as the result of__________?
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A. Inheritance of acquired characters

B. Over production

C. The theory of recapitulation

D. Natural selection

330. __________ is example of pure form of cellulose?
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A. Paper

B. Wool

C. Cotton

D. Silk

331. Non polar organic molecules are ___________ in water?
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A. Depends upon condition

B. Soluble

C. Insoluble

D. Partially soluble

332. The trioses which are intermediate in respiration and photosynthesis are_______________?
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A. Glyceraldehydes

B. Dihydroxy acetone

C. Both of these

D. None of these

333. Which of the following occurs in anaerobic respiration but not in aerobic respiration?
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A. Release of CO2

B. Reduction of NAD

C. Formation of ATP

D. Production of ethanol from acetaldehyde
334. Five kingdom classification was proposed by_____________?
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A. Robert Whittaker

B. Lynn Margulis and Karlene Schwartz

C. Carlous Linnaeus

D. E-Chatton

335. A bond formed by linkage between -OH of carboxyl group of one amino acid and H of amino group of another amino acid which releases water is called__________?
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A. Phosphodiester linkage

B. Glycosidic bond

C. Peptide bond

D. Hydrogen bond

336. Which one forms the raw material for coenzymes_______________________?
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A. Vitamins

B. Proteins

C. Carbohydrates

D. Metals

337. A cofactor made of inorganic ion which is detachable is called__________________?
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A. Cofactor

B. Coenzyme

C. Activator

D. Prosthetic group

338. Extreme change in pH results in______________?
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A. Change in ionization of amino acids at the active site of the enzyme

B. Increase in the reaction rate

C. Denaturation of the enzyme

D. Change in the ionization of the substrate

339. Spherical or tubular membranes which separate the material present in endoplasmic reticulum from that of cytoplasmic material are called__________?
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A. Cisternae

B. Cristae

C. Polysomes

D. Cytosol

340. According to cohesion-tension theory, tension is created by__________________?
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A. Transpiration

B. Root prerssure

C. Adhesion

D. Hydrogen bonding