Multiple Choice QuestionsIn the lactose operon of Escherichia coli what is the function of promoter
Binding of Gyrase enzyme
Binding of RNA polymerase
Codes for RNA polymerase
Processing of messenger RNA
Sex factor in bacteria is
F-replicon
chromosomal replicon
RNA
sex pillies
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).
Chromosomes can be stained with one of the following chemicals
acetocarmine
safranine
light green
eosin
In a DNA molecule, distance between two bases is
2 nm/ 20 Å
0.2 nm/ 2 Å
3.4 nm/ 34 Å
0.34 nm/ 3.4 Å
Balbiani rings are the sites of
DNA replication
RNA and protein synthesis
synthesis of lipids
synthesis of polysaccharides
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