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).
One of the following is sex-influenced character
Appearance of beard
Baldness in male
Docile behaviour of female
Low BMR in female
Polymerase chain reaction is most useful in
DNA synthesis
DNA amplification
protein synthesis
amino acid synthesis
The pyramid of energy-in a forest ecosystem is
always upright
always inverted
both (a) and (b)
none of the above
Lichens are important in the studies on atmospheric pollution because they
can grow in polluted atmosphere
can readily multiply in polluted atmosphere
efficiently purify the atmosphere
are very sensitive to pollutants like sulphur dioxide
In 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
The map distance between the genes A and B is 3 units, between B and C is 10 units and between C and A is 7 units. The order of the genes in a linkage map constructed on the above data would perhaps be
A, B, C
A, C, B
B, C, A
B, A, C
9: 3: 3: 1 ratio is modified to 9 : 7 ratio due to
complementary gene
epistatic gene
hypostatic gene
supplementary gene
sprouting of potato can be prevented in storage by
maleic hydrazide
gibberellins
indole acetic acid
cytokinins
