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 Multiple Choice QuestionsMultiple Choice Questions

241.

Jumping genes in maize were discovered by:

  • Hugo de Vries

  • T.H. Morgan

  • Barbara McClintock

  • Mendel


242.

Innitiation codon is :

  • AUG

  • UUU

  • UAG

  • AAG


243.

Non-coding sequences of DNA are:

  • exon

  • intron

  • rhizoids

  • cistron


244.

Mutations which alter nucleotide sequence within a gene are :

  • frame shift mutations

  • base pair substitutions

  • both 'a' and 'b'

  • none of these


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245.

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

  • E. coli

  • Nostoc

  • Drosophila

  • Neurospora


246.

Lac is obtained from :

  • Laccifer

  • Bombyx

  • Dactylopius

  • Lytta


247.

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

  • transition

  • translocation

  • deletion

  • transversion


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248.

Wobble hypothesis was given by

  • R.W. Holley

  • M. Nirenberg

  • H.G. Khorana

  • F.H.C. Crick


D.

F.H.C. Crick

The Wobble Hypothesis explains why multiple codons can code for a single amino acid. The triplet code is degenerate one with many codons than the number of amino acid types coded. It was given by F.H.C. Crick in 1966.


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249.

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.


250.

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.


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