Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Out of A-T, G-C pairing, bases of DNA may exist in alternate valency state owing to arrangement called

  • tautomerisational mutation

  • analogue substitution

  • point mutation

  • frameshift mutation


72.

Molecular scissors, which cut DNA at specific site is

  • pectinase

  • polymerase

  • restriction endonuclease

  • ligase


73.

SO2 pollution is indicated by

  • Desmodium (grasses)

  • Sphagnum (mosses)

  • Usnea (lichens)

  • Cucurbita (climbers)


74.

Sporopollenin is chemically

  • homopolysaccharide

  • fatty substance

  • protein

  • heteropolysaccharide


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75.

During replication of DNA, Okazaki fragments are formed in the direction of

  • 3' ➔ 5'

  • 5' ➔ 3'

  • 5'➔5'

  • 3' ➔ 3'


B.

5' ➔ 3'


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76.

The chemical nature of chromatin is as follows

  • nucleic acids

  • nucleic acid and histone proteins

  • nucleic acids, histone and non-histone proteins

  • nucleic acids and non-histone proteins


77.

Scirpophage incertulus is an example of

  • monophagus pest

  • diphagus pest

  • oligophagus pest

  • polyphagus pest


78.

Which one of the following ancestors of man first time showed bipedal movement

  • Australopithecus

  • Cro-magnon

  • Java ape man

  • Peking mann


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79.

Trophic levels in ecosystem is formed by

  • only bacteria

  • only plants

  • only herbivores

  • organisms linked in food chain


80.

The life span of honey bee drone is

  • 3-4 months

  • 1-2 months

  • 6-7 months

  • 10-12 months


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