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DNA Sequencing, Mutation and Repair

DNA Sequencing, Mutation and Repair
Genetic variations are

temporary
not heritable
influenced by the environment
stable

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

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

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

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

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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
A nonsense mutation may result into

a large deletion within the reading frame of a gene
modification of mRNA
a premature termination of the synthesis of a polypeptide
an abnormal elongation of a polypeptide

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

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

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