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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
transversion
lethal mutation
none of these

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

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

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

All of these
Excision
Incision
Ligation

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

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

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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
cause premature termination of the mRNA
cause a shift in reading frame
have no effect on the transcript or protein made

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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
phosphorylation
photoreactivation
photosynthesis

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