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Molecular Basis Of Inheritance

Question
CBSEENBI12047142
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Sex factor in bacteria is

  • F-replicon

  • chromosomal replicon

  • RNA

  • sex pillies

Solution

A.

F-replicon

In bacteria, besides nuclear DNA, there is some extrachromosomal or extranuclear DNA which is known as plasmid. Term plasmid was given by Lederberg (1952). On the basis of their function, the plasmids are of 3 types :

(i) F or fertility factor : Responsible for transfer of genetic material

(ii) R or resistance factor Provides resistance against drugs.

(iii) Colicinogenic factor : Provides colicines which kill other bacteria (other than which produce these colicines).

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 ?

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