Multiple Choice Questions

Advertisement

Which of the following is not a Pyrimidine?

  • Thymine

  • Uracil

  • Guanine

  • Cytosine


C.

Guanine

The nitrogenous bases are of two types:

(a) Pyrimidine base- cytosine, thymine

(b) Purine base- adenine, guanine

These nitrogenous bases are found in DNA/ RNA. Uracil is found in RNA in place of thymine.


Advertisement

One gene- one enzyme hypothesis of Beadle and Tatum was experimentally proved on

  • Saccharomyces 

  • Neurospora crassa

  • Lathyrus odoratus

  • Claviceps


Bio- indicators are used for

  • oxygen demand

  • air pollution

  • mineral present

  • All of the above


According to Kyoto protocol the major nations abide to reduce concentration of green house gases by

  • 2008

  • 2010

  • 2012

  • 2018


Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


Advertisement

Retrovirus have genetic material

  • DNA only

  • RNA only

  • DNA or RNA only

  • either DNA or RNA


Nitrifying bacteria are able to

  • convert atmospheric nitrogen into soluble forms

  • convert ammonia to nitrate

  • ammonia to nitrogen

  • nitrate to nitrogen


RNA is not found in

  • chromosome

  • plasmalemma

  • nucleolus

  • ribosome


Study of Ecology of population is called

  • Autecology

  • Synecology

  • Ecotype

  • Demecology


Advertisement

A lake with nutrients is called

  • trophic

  • euphotic

  • oligotrophic

  • eutrophic