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DNA Sequencing, Mutation and Repair

DNA Sequencing, Mutation and Repair
Which of the following mutations arise without exposure to external agents?

Spontaneous mutations
Induced mutations
Analogous mutations
None of these

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DNA Sequencing, Mutation and Repair
Frame shift mutation may occur as a result of

None of these
conversion of guanine to xanthine
formation of a thymine-dimer
deamination of cytosine to uracil

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DNA Sequencing, Mutation and Repair
Thymine dimers are directly repaired with the help of visible light by process known as

phosphorylation
photoreactivation
excision repair
photosynthesis

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DNA Sequencing, Mutation and Repair
When mutations involve vital functions so that the mutants are nonviable, it is a

lethal mutation
nonsense mutation
transversion
none of these

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DNA Sequencing, Mutation and Repair
The mutation which will not affect the length of a protein is,

nonsense mutation
all of these
missense mutation
frameshift mutation

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DNA Sequencing, Mutation and Repair
The promoter on an expression vector used to overproduce proteins in bacteria is

a bacterial promoter
expressed both in bacteria and mammalian cells
not a regulated promoter
the natural promoter of the gene being cloned

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