DNA Sequencing, Mutation and Repair

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DNA Sequencing, Mutation and Repair

Question 1 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A mutagen is defined as
A
an enzyme that repairs mutations
B
a chemical or physical agent that induces mutations
C
an inhibitor of gene modification
D
a molecule which stabilizes DNA thus prevents mutations from occurring
Question 2 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The DNA sequences of rRNA genes can be used to
A
assess relatedness of eukaryotes but not prokaryotes
B
obtain a tentative identification of a new microorganism
C
predict the pulsed field gel pattern of a microorganism
D
predict whether a bacteria will be gram-positive or gram-negative
Question 3 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Due to which of the following DNA repair mechanisms, one is able to distinguish newly synthesized DNA strands from older one?
A
New strands do not contain cytosine bases
B
New strands are lower in molecular size
C
Old strands are methylated while new strands are not
D
New strands are methylated while old strands are not
Question 4 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Changes in which of the following characterizes mutations?
A
Phenotype
B
Genotype
C
Both (a) and (b)
D
None of these
Question 5 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Frame shift mutation may occur as a result of
A
formation of a thymine-dimer
B
deamination of cytosine to uracil
C
conversion of guanine to xanthine
D
none of the above
There are 5 questions to complete.