Non-coding sequences of DNA are:

• exon

• intron

• rhizoids

• cistron

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.

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

• transition

• translocation

• deletion

• transversion

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.

Lac is obtained from :

• Laccifer

• Bombyx

• Dactylopius

• Lytta

Jumping genes in maize were discovered by:

• Hugo de Vries

• T.H. Morgan

• Barbara McClintock

• Mendel

Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?

• E. coli

• Nostoc

• Drosophila

• Neurospora

Wobble hypothesis was given by

• R.W. Holley

• M. Nirenberg

• H.G. Khorana

• F.H.C. Crick

Innitiation codon is :

• AUG

• UUU

• UAG

• AAG

Mutations which alter nucleotide sequence within a gene are :

• frame shift mutations

• base pair substitutions

• both 'a' and 'b'

• none of these