How many variable segments are present in the basic structure of

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Radula is found in

  • Pila sp.

  • Chiton sp.

  • Lamellidens sp.

  • Pinctada sp.


52.

Which phase comes in between the G1 and G2 phases of cell cycle?

  • M - phase

  • G- phase

  • S - phase

  • Interphase


53.

How many effective codons are there for the synthesis of twenty amino acids?

  • 64

  • 32

  • 60

  • 61


54.

Chromosome is made up of

  • DNA and pectin

  • RNA and DNA

  • DNA and histone

  • only histone


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55.

Cell division cannot be stopped in which phase of the cell cycle?

  • G1- phase

  • G2- phase

  • S- phase

  • Prophase


56.

Cell theory is not applicable for

  • bacteria

  • fungus

  • algae

  • virus


57.

The difference between systolic and diastolic pressure in human is

  • 120 mm Hg

  • 80 mm Hg

  • 40 mm Hg

  • 200 mm Hg


58.

Which one of the following viruses contains is a DNA and RNA?

  • Cyanophage

  • Herpes virus

  • Leuko virus

  • Polio virus


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59.

How many variable segments are present in the basic structure of antibody molecule?

  • One

  • Two

  • Three

  • Four


D.

Four

An antibody is a Y-shaped protein molecule that is made by a B-lymphocyte in response to a particular antigen. It consists of four polypeptide chains, two long or heavy chains and two short or light chains. Each molecule has two identical antigen binding sites which are formed by both light and heavy chains. Much of the molecule is constant but the tips of the 'Y' are variable and match precisely part of a particular antigen molecule.

In the above figure, Blue and yellow colour represents variable region on both heavy and light chain respectively.


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60.

Transposons are

  • house-keeping genes

  • jumping genes

  • transporting genes

  • stationary genes


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