biology MCQs – Page 15

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 Review each marked answer and report any item that may be outdated or unclear.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

281. The simplest of oxygen producting photosynthetic organisms are____________?
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A. Bacteria

B. Cyanobacteria

C. Chlamydomonas

D. Algae

282. Which of the following organisms have Chitin as a major structural component of their cell wall________________?
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A. Protoctista

B. Prokaryotae

C. Plantae

D. Fungi

283. An activated enzyme consisting of polypeptide chain and a cofactor is called_______________?
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A. Apoenzyme

B. Holoenzyme

C. Activated enzyme

D. Both b and c

284. Which one the following fatty acid is more soluble in an organic solvent and has higher melting point____________?
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A. Butyric acid

B. Palmitic acid

C. All have same

D. Acetic acid

285. Which of the following substance is most favorable to form structural component of biological membranes___________?
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A. Hydrophilic Carbohydrates

B. Hydrophobic fats.

C. Both a and b

D. None of these

286. Hunger pangs usually begin ______ after the previous meal.
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A. 12-24 hours

B. 2-4 hours

C. 6-8 hours

D. 10-12 hours

287. Which of the statement about cell membrane is not true?
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A. It contains protein molecules embedded in lipid bilayer

B. It is a differentially permeable membrane.

C. It may get infolded to engulf solid or liquid material.

D. It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.

288. Animals fats are ______________ atroom temperature?
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A. None of these

B. Gases

C. Liquids

D. Solids

289. The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called_________________?
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A. Chemistry

B. Biochemistry

C. Molocular biology

D. Both a and b

290. Carbon commonly combines with______________?
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A. H

B. All of these

C. N & O

D. P & S

291. Which of the following does not show quaternary structure____________?
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A. Fibrin

B. Haemoglobin

C. Insulin

D. Pepsin

292. Annual rainfall in grassland is about_____________?
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A. More than 2500 mm

B. 250-750 mm

C. 750-1500 mm

D. Less than 250 mm

293. Sleep movements are a type of___________?
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A. Tactic movements

B. Growth movements

C. Paratonic movments

D. Turgor movements

294. Interconversion of carbohydrates proteins and lipids in living cells are an example of____________?
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A. Coordinated catabolic activities

B. Coordinated anabolic activities

C. Both A and B

D. Any one

295. Which of the following is most constant abiotic component of ecosystem___________?
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A. Water

B. Air

C. Gravity

D. Land

296. Proteins comprise of ___________% of the total dry weight of a cell?
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A. 40%

B. 70%

C. 50%

D. 60%

297. An enzyme which converts a dipeptide into separate amino acids is an example of__________?
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A. Hydrolase

B. Oxidoreductase

C. Decarboxylase

D. Transferase

298. Which of the following impart a red colour to Rose petals?
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A. Chloroplast

B. Chlorophyll

C. Chromoplast

D. Leucoplast

299. Which chemical component has the greatest contribution in the total mammalian cell weight__________?
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A. Carbohydrate

B. Water

C. Proteins

D. Lipids

300. Which of the following is the empirical formula of chlorophyll b?
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A. C55H72O5N4Mg

B. C55H70O5N4Mg

C. C55H70O6N4Mg

D. C55H72O6N4Mg

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