biology MCQs – Page 21

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 Review each marked answer and report any item that may be outdated or unclear.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
401. Ribose is an example of___________?
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A. Hexose

B. Trioses

C. Tetroses

D. Pentose
402. The monosaccharide found in some bacteria and occurring rarely are______________?
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A. Tetroses

B. Pentoses

C. Trioses

D. Hexoses

403. The cell wall of oomycetes is chiefly composed of___________?
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A. Lignin

B. Chitin

C. Cellulose

D. Proteins

404. Which one is the basic element of organic compounds _________________?
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A. Oxygen

B. Carbon

C. Sulphur

D. Hydrogen

405. Maximum number of species of living things on earth are___________?
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A. Algae

B. Insects

C. Protozoa

D. Fungi

406. Only myosine is present in_____________?
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A. A band

B. H zone

C. 1 band

D. Sarcomere

407. Malonic acid is an example of____________?
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A. Irreversible inhibitor

B. Non-competitive inhibitor

C. Competitive inhibitor

D. Reversible inhibitor

408. In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?
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A. Their physical properties like size & weight.

B. Physical properties of the medium like its density.

C. Their electrical properties like their charges

D. Both a and b
409. Which one of the following stage preceeds mitosis during cell cycle?
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A. G2 phase

B. G1 phase

C. S phase

D. M phase

410. If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________?
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A. The enzyme substrate complex is probably failing to form during the reaction

B. There is probably more substrate present than there is enzyme.

C. There is probably more enzayme available than there is substrate.

D. There is probably more product present than there is either substrate or enzyme.

411. In condition of high temperature, following does not occur or occurs at low level__________?
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A. Evaporative cooling

B. Vasodilation

C. Thermogenesis

D. Activation of sweat glands

412. Which of the following is not present in mitochondria?
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A. Thylakoids

B. Enzymes

C. Co-enzymes

D. Ribosomes

413. Which of the following are triploblastic and acoelomate?
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A. Platyhelminthes

B. Aves

C. Sponges

D. Annelida

414. Okazaki fragments are connected together through action of_________________?
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A. Primase

B. Polymerase

C. Ligase

D. Helicase

415. Who coined the term CELL?
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A. Schwann

B. Schleiden

C. Robert Hook

D. Both a and b

416. What is the characteristic feature of consumers?
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A. Saprophyte

B. Autotroph

C. Parasite

D. Heterotroph
417. Adult birds normally possess only one functional____________?
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A. Ovary

B. Ureter

C. Lung

D. Testis

418. In living organisms the lubricant which provides protection against damage resulting from friction is___________?
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A. Carbohydrates

B. Fatty acid

C. Protein

D. Water
419. Test cross is used to find_____________?
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A. Trait

B. Genotype

C. Ratios

D. Phenotype

420. Solanum tuberosum is a scientific name of___________?
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A. Tomato

B. Potato

C. Onion

D. Amaltas