Multiple Choice Questions

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

  • Cyanophage

  • Herpes virus

  • Leuko virus

  • Polio virus


C.

Leuko virus

We all know that all cells have double-stranded DNA as their genetic material. But, in contrast, all viruses possess either DNA or RNA as their genetic material, and it can be either single-stranded or double-stranded. However, there is a third group of viruses that use both DNA and RNA as their genetic material but at different stages of their reproductive cycle. This third group is examplified by retroviruses which contain RNA as genetic material but replicate through a DNA intermediate, and hepadnaviruses (human hepatitis-B virus) which contains DNA as in replication genetic material but has an RNA intermediate.


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Radula is found in

  • Pila sp.

  • Chiton sp.

  • Lamellidens sp.

  • Pinctada sp.


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

  • M - phase

  • G- phase

  • S - phase

  • Interphase


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

  • 64

  • 32

  • 60

  • 61


Chromosome is made up of

  • DNA and pectin

  • RNA and DNA

  • DNA and histone

  • only histone


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

  • G1- phase

  • G2- phase

  • S- phase

  • Prophase


Cell theory is not applicable for

  • bacteria

  • fungus

  • algae

  • virus


The difference between systolic and diastolic pressure in human is

  • 120 mm Hg

  • 80 mm Hg

  • 40 mm Hg

  • 200 mm Hg


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

  • One

  • Two

  • Three

  • Four


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Transposons are

  • house-keeping genes

  • jumping genes

  • transporting genes

  • stationary genes