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Molecular Basis Of Inheritance

Question
CBSEENBI12047263
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Out of A-T, G-C pairing, bases of DNA may exist in alternate valency state owing to arrangement called

  • tautomerisational mutation

  • analogue substitution

  • point mutation

  • frameshift mutation

Solution

A.

tautomerisational mutation

In the early 1950s, guanine and thymine were generally portrayed in the enol form, although there was little data to support the predominance of one form over the other. James Watson and Francis Crick discovered that by using the keto forms instead of the enol forms, they could 'form' two base pairs, an adenine thymine pair and a guanine-cytosine pair, that had the same overall size and shape. These base pairs formed the basis for Watson and Crick's model of DNA.

The process of changing keto form in to enol form of a given organic compound is known as tautomerisational mutation.

Some More Questions From Molecular Basis of Inheritance Chapter

List the number of base pairs in :

(i) lambda bacteriophage

(ii) E.coli and

(iii) haploid content of human DNA.

Comment two chains of DNA have antiparallel polarity.

What is the difference between DNAs and DNAase ?

Which was first genetic material ?

Suggest one evidence to prove that RNA was first genetic material.

Why was RNA unstable ?

What made DNA more preferrable as genetic material ?

Process of replication is completed in how much time in E.coli ?

What is average rate of polymerization ?

List three components of transcription unit.

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