Multiple Choice Questions

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Balbiani rings are the sites of

  • DNA replication

  • RNA and protein synthesis

  • synthesis of lipids

  • synthesis of polysaccharides


B.

RNA and protein synthesis

Balbiani rings are large puffs on the polytene chromosomes in the dipteran Chironomus tentans. These puffs are used for the studies of the structure of active genes and the synthesis and transport of specific RNA- protein particles.


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MRI is not allowed in the following conditions except one. Identify the exception

  • Presence of pacemaker in the body

  • Pregnant women

  • Person suffering from stroke

  • Presence of metallic plate in the body for treatment of broken bones


Exine of pollen grain is made up o

  • pectocellulose

  • lignocellulose

  • sporopollenin

  • pollen kit


Root cells of wheat has 2n = 42 chromosomes. Which one of the following is the basic chromosome number of wheat?

  • 42

  • 21

  • 7

  • 14


In a DNA molecule, distance between two bases is

  • 2 nm/ 20 Å

  • 0.2 nm/ 2 Å

  • 3.4 nm/ 34 Å

  • 0.34 nm/ 3.4 Å


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First genetically modified plant commercially released in India is

  • golden rice

  • slow ripening tomato

  • Bt brinjal

  • Bt cotton


Test cross is a cross between

  • hybrid and dominant parent

  • hybrid and recessive parent

  • two hybrid parents

  • two distantly related species


Hormone responsible for the secretion of milk after parturition is

  • ICSH

  • Prolactin

  • ACTH

  • LH


Micropropagation is a technique for production of

  • true to type plants

  • haploid plant

  • somatic hybrids

  • somaclonal plants


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Which of the following diseases is related to cadmium pollution?

  • Minamata

  • Pneumoconiosis

  • Anaemia

  • Itai- Itai