Multiple Choice Questions

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The chemical knifes of DNA are

  • polymerases

  • ligases

  • endonucleases

  • amylases


C.

endonucleases

A restriction enzyme or restriction endonuclease is an enzyme that cleaves DNA into fragments at or near specific recognition sites within the molecule known restriction sites.


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What will be the number of Calvin cycles to generate one molecule of hexose?

  • 4

  • 6

  • 8

  • 9


Protein deficiency disease is

  • eczema

  • cirrhosis

  • kwashiorkor

  • night blindness


The ornithine cycle removes two waste products from the blood in liver. These products are

  • CO2 and urea

  • ammonia and urea

  • CO2 and ammonia

  • ammonia and uric acid


Lampbrush chromosomes are seen in which typical stage

  • mitotic anaphase

  • mitotic prophase

  • mitotic metaphase

  • meiotic prophase


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Which of the following products are obtained by anaerobic respiration from yeast?

  • Alcohols

  • CO2

  • Beer and Wine

  • All of the above


2n - 1 condition is called

  • trisomy

  • monosomy

  • nullisomy

  • tetrasomy


CO is a pollutant because

  • it reacts with O2

  • it inhibits glycolysis

  • it reacts with haemoglobin

  • it makes nervous system inactive


Benthoic animals are those, which

  • are deep dweller in sea

  • are floating (free) organisms

  • are submerged in sea

  • float on the sea surface


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In C4 plants, CO, fixation is done by

  • mesophyll cells

  • guard cells

  • sclerenchyma

  • chlorenchyma and hypodermis