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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?

None of these
Induced mutations
Analogous mutations
Spontaneous mutations

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DNA Sequencing, Mutation and Repair
Which of these mechanisms for thymine dimers repair lead to mutations?

SOS repair
Photoreactivation
Excision repair
Never leads to mutation

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DNA Sequencing, Mutation and Repair
Which of the following mutation affects only a single nucleotide?

Site mutation
Point mutation
Regional mutation
Aerial mutation

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

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

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

none of these
transversion
lethal mutation
nonsense mutation

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DNA Sequencing, Mutation and Repair
Which of the following(s) is/are steps in excision repair mechanisms?

Excision
Ligation
All of these
Incision

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