Multiple Choice QuestionsOut 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
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.
Molecular scissors, which cut DNA at specific site is
pectinase
polymerase
restriction endonuclease
ligase
SO2 pollution is indicated by
Desmodium (grasses)
Sphagnum (mosses)
Usnea (lichens)
Cucurbita (climbers)
During replication of DNA, Okazaki fragments are formed in the direction of
3' ➔ 5'
5' ➔ 3'
5'➔5'
3' ➔ 3'
The chemical nature of chromatin is as follows
nucleic acids
nucleic acid and histone proteins
nucleic acids, histone and non-histone proteins
nucleic acids and non-histone proteins
Scirpophage incertulus is an example of
monophagus pest
diphagus pest
oligophagus pest
polyphagus pest
Which one of the following ancestors of man first time showed bipedal movement
Australopithecus
Cro-magnon
Java ape man
Peking mann
Trophic levels in ecosystem is formed by
only bacteria
only plants
only herbivores
organisms linked in food chain
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