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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?

Analogous mutations
Spontaneous mutations
Induced mutations
None of these

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DNA Sequencing, Mutation and Repair
Genetic variations are

stable
influenced by the environment
not heritable
temporary

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

nonsense mutation
none of these
lethal mutation
transversion

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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
photosynthesis
photoreactivation
excision repair

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DNA Sequencing, Mutation and Repair
Changes in which of the following characterizes mutations?

None of these
Phenotype
Genotype
Both (a) and (b)

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DNA Sequencing, Mutation and Repair
A nonsense mutation introduced into the DNA sequence of a gene may

have no effect on the transcript or protein made
cause premature termination of the mRNA
cause a shift in reading frame
shorten the length of the protein encoded by the gene

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