Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Which of the following pair is characterised by swollen lips, thick pigmented skin of hands and legs and irritability ?

  • Iodine - Goitre

  • Protein - Kwashiorkor

  • Thiamine - Beri-beri

  • Nicotinamide- Pellagra


52.

The molecular structure of insulin was first described by :

  • Korenberg

  • Swaminathan

  • Richardson

  • Sanger


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53.

Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species ?

  • Pfr forms

  • Pr forms

  • Both forms

  • None of these


A.

Pfr forms

Pfr form of phytochrome refers to physiologically active form whereas Pr form refers to inactive form. 

Red light formation means the formation of Pfr. It helps in the induction of seed germination. On the contrary, far red light or Pr formation inhibits the germination.


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54.

Insect resistance transgenic cotton has been produced by inserting a piece of DNA from:

  • an insect

  • a bacterium

  • a wild relative of cotton

  • a virus


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55.

Mutations which alter nucleotide sequence within a gene are :

  • frame shift mutations

  • base pair substitutions

  • both 'a' and 'b'

  • none of these


56.

Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?

  • E. coli

  • Nostoc

  • Drosophila

  • Neurospora


57.

When a tall plant with rounded seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), the F1 generation consists of tall plants with rounded seeds. How many types of gametes an F1 plant would produce ?

  • One

  • Three

  • Four

  • Eight


58.

Tetradynamous stamens are found in :

  • Chrysanthemum

  • Zinnia

  • Poppy

  • Brassica


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59.

Diadelphous stamens are the characteristic features of :

  • Ranunculaceae

  • Fabaceae

  • Poaceae

  • Malvaceae


60.

Human immuno deficiency virus causes

  • Acquired immuno deficiency syndrome

  • Anthrax

  • Tuberculosis

  • Polio


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