DNA Sequencing, Mutation and Repair

 

 DOWNLOAD ALL  PDF E-BOOK's    >>>CLICK HERE<<<

DNA Sequencing, Mutation and Repair

Question 1
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
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
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
Changes in which of the following characterizes mutations?
A
Phenotype
B
Genotype
C
Both (a) and (b)
D
None of these

Question 5
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

Question 6
When mutations involve vital functions so that the mutants are nonviable, it is a
A
nonsense mutation
B
lethal mutation
C
transversion
D
none of these

Question 7
A nonsense mutation introduced into the DNA sequence of a gene may
A
cause premature termination of the mRNA
B
shorten the length of the protein encoded by the gene
C
have no effect on the transcript or protein made
D
cause a shift in reading frame

Question 8
Which of the following bacterial genome was sequenced first?
A
E. coli
B
S. pneumoniae
C
H. influenzae
D
S. thermophilus

Question 9
A nonsense mutation may result into
A
an abnormal elongation of a polypeptide
B
a large deletion within the reading frame of a gene
C
a premature termination of the synthesis of a polypeptide
D
modification of mRNA

Question 10
What was the first eukaryotic chromosome to be sequenced?
A
Yeast chromosome III
B
Yeast chromosome XI
C
Arabidopsis chromosome IV
D
None of these
There are 10 questions to complete.

 

 DOWNLOAD ALL  PDF E-BOOK's    >>>CLICK HERE<<<