Multiple Choice Questions

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Structural element of chromatin is

  • histone

  • acid protein and DNA

  • nuclear matrix

  • nucleosomes


D.

nucleosomes

Chromatin is composed of nucleosome which contains eight histone molecule around which DNA is wound. Some portion of chromatin takes darker stain during interphase called heterochromatin while the portion which take lighter stain are called euchromatin.


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The scientific name of the moth which produce tasar is

  • Bombyx mori

  • Antherae mylitta

  • Antherae assamensi

  • Philosomia ricini


Acid rain is caused by

  • NO2

  • SO2 and NO2

  • SO3

  • CO2


Ovule integument gets transformed into

  • seed

  • fruit wall

  • seed coat

  • cotyledons


Fertilization occur in

  • uterus

  • ureter

  • vagina

  • fallopian tube


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Biolistic technique is used in

  • tissue culture process

  • gene transfer process

  • hybridization process

  • germplasm conservation process


Polyploid derived from two different species is called

  • autopolyploid

  • triploid

  • allopolyploid

  • monoploid


The name of the pace maker of the heart is

  • lymph node

  • SA node

  • juxtaglomerular apparatus

  • semilunar valve


Which of the following is related to humoral immunity?

  • T- lymphocyte

  • B- lymphocyte

  • I- lymphocyte

  • P- lymphocyte


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Pieces of plant tissue used in culture is called

  • explant

  • domaclone

  • inoculant

  • clone