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 Multiple Choice QuestionsMultiple Choice Questions

231.

Enzyme required for transcription is

  • RNAse

  • Endonuclease

  • RNA polymerase

  • DNA polymerase


232.

The process of multiplication of DNA from DNA is known as

  • replication

  • transversion

  • transcription

  • translation


233.

A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?

  • Introns

  • Exons

  • Both 'a' and 'b'

  • None of the above


234.

The number of hydrogen bonds between adenine and thymine in a DNA molecule is :

  • two

  • three

  • four

  • eight


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235.

Sequence of DNA (Non- coding) is known as:

  • exon

  • intron

  • cistron

  • none


236.

In DNA, which is absent :

  • Adenine

  • Thymine

  • Guanine

  • Uracil


237.

Which is called soluble RNA ?

  • rRNA

  • tRNA

  • mRNA

  • hnRNA


238.

Mutation is more common when it is present in:

  • dominant condition

  • recessive condition

  • constant in population

  • none of the above


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239.

In DNA, which is absent ?

  • Adenine

  • Guanine

  • Uracil

  • Cytosine


C.

Uracil

Uracil is absent in DNA. It is present in RNA, instead of thymine. 

In DNA, adenine and guanine are purines and thymine and cytosine are pyrimidines.

In RNA, uracil and cytosine makes pyrimidine.


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240.

Which of the following constitute about 10-20% of total circular RNA?

  • m-RNA

  • r -RNA

  • t-RNA

  • hn -RNA


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