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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

nonsense mutation
lethal mutation
none of these
transversion

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

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

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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
Which of the following(s) is/are steps in excision repair mechanisms?

Incision
Ligation
All of these
Excision

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DNA Sequencing, Mutation and Repair
Which of the following bacterial genome was sequenced first?

S. thermophilus
E. coli
S. pneumoniae
H. influenzae

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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 a shift in reading frame
shorten the length of the protein encoded by the gene
cause premature termination of the mRNA

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