In RNA thymine is replaced by

• uracil

• adenine

• thiamine

• guanine

Assertion : Clones are a group of organisms of identical genotype, produced by a single parent through asexual means.

Reason : Clones exhibit high genetic variations.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both the assertion and reason are false.

Radio-tracer technique shows that DNA is in

• single-helix stage

• double-helix stage

• multi-helix stage

• none of these

Assertion : The mRNA attaches itself to the ribosome via its 3' end.

Reason : The mRNA has F-capsular nucleotide and bases of lagging sequence.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Extranuclear genes occurs in

• plastids and are not inherited

• plasmid and are not inherited

• mitochondria and are inherited by female

• mitochondria and are inherited by male

6.

The chemical knifes of DNA are

• polymerases

• ligases

• endonucleases

• amylases

Wobble hypothesis was given by

• R.W. Holley

• M. Nirenberg

• H.G. Khorana

• F.H.C. Crick

Assertion : Plasmids are double stranded extrachromosomal DNA.

Reason : Plasmids are possessed by eukaryotic cells.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both the assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false.

• If both the assertion and reason are false.

Assertion : Watson and Crick provided experimental proof of semiconservative nature of DNA replication.

Reason : DNA polymerase binds nucleotides in replication.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true.

A point mutation comprising the substitution of a purine by pyrimidine is called

• transition

• translocation

• deletion

• transversion