biology MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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
421. A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?
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A. Non-competitive inhibitor

B. Reversible inhibitor

C. Competitive inhibitor

D. Irreversible inhibitor

422. In Cx(H2O)y x ranges from______________?
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A. 1 to 3 thousand

B. 3 to many thousand

C. 5 to 9 thousand

D. 3 to 5 thousand

423. Ozone depletion occurs commonly due to_______________?
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A. UV rays

B. Chlorofluorocarbons

C. Deforestation

D. Carbon dioxide

424. In Hardy-Weinberg formula P2 represents frequency of_____________?
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A. Homozygous dominant individual

B. Dominant allele

C. Recessive allele

D. Homozygous recessive individual

425. In Glycin an amino acid R group is replaced by____________?
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A. CH3

B. C = O

C. COOH

D. H
426. Cellulose is the major component of__________?
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A. Secondary wall

B. all of the above

C. Primary wall

D. Middle lamella

427. Peptide bond is_____________?
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A. C- O lind

B. C-N link

C. N-H link

D. C-H link

428. The type of learning in which there is loss or decrease in response to repeated stimuli?
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A. Latent learning

B. Imprinting

C. Insight learning

D. Habituation
429. Locomotory structures are not found in which of the following group?
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A. Zooflagellates

B. Apicomplexans

C. Amoebas

D. Ciliates

430. The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?
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A. If the concentration is doubled the rate will become two fold.

B. Increase in enzyme molecule increases the available active sites.

C. This relation is for unlimited time period with unlimited enzyme concentration

D. None of these.

431. How many carbon atoms are required to form a furan ring (ribofuranose)_____________?
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A. 5

B. 3

C. 4

D. 2

432. Amphoixus is a__________?
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A. Lower chordate

B. All of these

C. Protochordate

D. Chordate

433. Total number of amino acids in a hemoglobin molecule are__________?
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A. 554

B. 574

C. 584

D. 564

434. Amoeboid movements and movement of cyclosis is due to_________?
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A. Microfilaments

B. Microtubules

C. Intermediate filaments

D. Cytoskeleton

435. Which of the statement is not true for compounds like glycoprotein and glycolipids____________?
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A. They are conjugated molecules of carbohydrates

B. Both have role in the extra cellular matrix of animals and bacterial cell wall

C. They are components of biological membranes.

D. Both are produced and secreted by endoplasmic reticulum
436. The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called___________?
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A. Specific Heat of Vaporization

B. Specific Heat capacity

C. Caloric Heat

D. Both A and C

437. All of the following veins carry deoxygenated blood except
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A. Pulmonary vein

B. Superior vena cava

C. Hepatic vein

D. Inferior vena cava

438. Percentage of proteins in cell membrane is____________?
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A. 40-50%

B. 80-100%

C. 20-40%

D. 60-80%
439. Sapwood is formed from_____________?
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A. Primary xylem

B. Secondary phloem

C. Primary phloem

D. Secondary xylem
440. Ribosomes are assembled in__________?
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A. Nucleus

B. RNA

C. DNA

D. Nucleolus