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DNA Sequencing, Mutation and Repair

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

lethal mutation
transversion
nonsense mutation
none of these

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

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

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DNA Sequencing, Mutation and Repair
A nonsense mutation may result into

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

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

SOS repair
Excision repair
Never leads to mutation
Photoreactivation

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

excision repair
photosynthesis
phosphorylation
photoreactivation

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

all of these
nonsense mutation
missense mutation
frameshift mutation

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