biology MCQs – Page 11

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 Review each marked answer and report any item that may be outdated or unclear.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
201. Cytoskeleton involved in assembly and disassembly of the spindle during mitosis is of_________?
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A. None of these

B. Intermediate filaments

C. Microtubules

D. Microfilaments

202. A large regional community primarily determined by climate is called ?
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A. Biome

B. Population

C. Community

D. Habitat

203. ___________ is the potential surce of chemical energy for cellular activities?
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A. C-H bond

B. C-O bond

C. P-O-C bond

D. C-N bond

204. An unbroken series of species arranged in ancestors to descendent sequence with each later species having evolved from one that immediately preceded it is called?
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A. Phyletic lineage

B. Population

C. Community

D. Biome

205. Group of living organisms of the same species living in the same place at the same time is called________?
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A. Community

B. Biome

C. Ecosystem

D. Population
206. So far over _____________ number of species of animals are known?
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A. million

B. 2 million

C. 1

D. 1 million

207. Double fertilization occurs in_________?
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A. All seed plants

B. Gymnosperms

C. All plants

D. Angiosperms
208. helical structure is kept by the formation of _________ bonds among amino acids molecules?
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A. Hydrophobic bonds

B. Disulphide Bond

C. H bonds

D. Ionic bond

209. Ecosystem not found in Pakistan is_____________?
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A. Grassland

B. Temperate deciduous forest

C. Tundra

D. Tropical rain forest
210. A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________?
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A. Blocker

B. Co-enzyme

C. Cofactor

D. Inhibitor
211. A genome is___________?
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A. All of these

B. Genetic basis of few characters

C. Appearance of an individual

D. Full set of genes of an individual
212. The discease in which transmembrane carrier for the chloride ion is not produced is__________?
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A. Hyperchloesterolemia

B. Cystic fibrosis

C. Severe combined immunodeficiency syndrome

D. AIDS

213. In most ecosystems the greatest amount of energy flows through the____________?
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A. Carnivores

B. Herbivores

C. Secondary consumers

D. Decomposers

214. Each turn of DNA contain ____________ nitrogenous base pairs?
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A. 10

B. 20

C. 5

D. 25

215. _____________ supported theory of special creation?
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A. Lamarck

B. Linnaeus

C. Mendel

D. Aristotle

216. The structure of an enzyme is altered by____________?
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A. Reversible inhibitor

B. Non-competitive inhibitor

C. Irreversible inhibitor

D. Competitive inhibitor

217. If a plasmolysed plant cell is placed in water the cell will___________?
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A. Show no change in it

B. Be Killed

C. Be deplasmolysed

D. Burst

218. DNA or RNA of viruses is enclosed in _______________ coat?
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A. DNA

B. Protein

C. Carbohydrate

D. Lipid

219. The one which is incorrect pair?
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A. Lycopods Ground pries

B. Dichotomous Vernation

C. Arthrophytes Jointed

D. Sori Indusium

220. Embryonic induction is caused by part developing from_____________?
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A. Extraembryonic layers

B. Ectoderm

C. Mesoderm

D. Endoderm