BIOL2321 MICROBIOLOGY EXAM 2
QUESTIONS AND ANSWERS
Binding of tryptophan to the ________ makes a holorepressor.
a. aporepressor
b. corepressor
c. repressor
d. inducer
e. activator - Correct Answers -a. aporepressor
Mutations that occur even in the absence of an added mutagen are known as ________
mutations.
a. spontaneous
b. silent
c. missense
d. nonsense
e. frameshift - Correct Answers -a. Spontaneous
Peptidyl transferase catalyzes the movement of the peptide from the tRNA in the
______ to the tRNA in the
a. P-site; A-site
b. A-site; P-site
c. E-site; A-site
d. E-site; P-site - Correct Answers -a. P-site; A-site
Which of the following is the favored carbon source of Escherichia coli?
a. lactose
b. galactose
c. sucrose
d. glucose
e. fructose - Correct Answers -d. glucose
The little amount of sigma H that is made at 30"1eC is ________ by the
DnaK/GrpE/DnaJ chaperones.
a. enhanced
b. activated
c. degraded
d. protected
, e. secreted - Correct Answers -c. degraded
The value of studying a transcriptome rather than a genome is that
a. RNA is much easier to work with than DNA.
b. bacterial RNA have a half life longer than bacterial DNA
c. one can get a snapshot of what genes are expressed under some conditions but not
others.
d. a transcriptome represents the collection of all proteins present in the cell
e. deep sequencing can only be performed on RNA. - Correct Answers -c. one can get
a snapshot of what genes are expressed under some conditions but not others.
Using the genetic code shown below, find the correct start and stop codons. Which of
the following peptides might this message code for?
(refer to pdf for image)
5'-GAGUUAUGGGUUCUCUGUGUUGA-3'
a.
GLU-LEU-CYS-MET-GLY-SER-MET-CYS
b.
MET-GLY-SER-LEU-CYS
c.
MET-HIS-GLY-PHE-TYR-VAL
d.
MET-CYS-ILE-LEU-GLY-THR-TYR
e.
ASP-VAL-TYR-LEU-GLY-TYR-VAL-LEU - Correct Answers -b.
MET-GLY-SER-LEU-CYS
All the cell's expressed RNAs are collectively referred to as the cell's
a. genome.
b. transcriptome
c. proteome.
d. holoenzyme.
e. ORF. - Correct Answers -b. transcriptome
Codons and anticodons
QUESTIONS AND ANSWERS
Binding of tryptophan to the ________ makes a holorepressor.
a. aporepressor
b. corepressor
c. repressor
d. inducer
e. activator - Correct Answers -a. aporepressor
Mutations that occur even in the absence of an added mutagen are known as ________
mutations.
a. spontaneous
b. silent
c. missense
d. nonsense
e. frameshift - Correct Answers -a. Spontaneous
Peptidyl transferase catalyzes the movement of the peptide from the tRNA in the
______ to the tRNA in the
a. P-site; A-site
b. A-site; P-site
c. E-site; A-site
d. E-site; P-site - Correct Answers -a. P-site; A-site
Which of the following is the favored carbon source of Escherichia coli?
a. lactose
b. galactose
c. sucrose
d. glucose
e. fructose - Correct Answers -d. glucose
The little amount of sigma H that is made at 30"1eC is ________ by the
DnaK/GrpE/DnaJ chaperones.
a. enhanced
b. activated
c. degraded
d. protected
, e. secreted - Correct Answers -c. degraded
The value of studying a transcriptome rather than a genome is that
a. RNA is much easier to work with than DNA.
b. bacterial RNA have a half life longer than bacterial DNA
c. one can get a snapshot of what genes are expressed under some conditions but not
others.
d. a transcriptome represents the collection of all proteins present in the cell
e. deep sequencing can only be performed on RNA. - Correct Answers -c. one can get
a snapshot of what genes are expressed under some conditions but not others.
Using the genetic code shown below, find the correct start and stop codons. Which of
the following peptides might this message code for?
(refer to pdf for image)
5'-GAGUUAUGGGUUCUCUGUGUUGA-3'
a.
GLU-LEU-CYS-MET-GLY-SER-MET-CYS
b.
MET-GLY-SER-LEU-CYS
c.
MET-HIS-GLY-PHE-TYR-VAL
d.
MET-CYS-ILE-LEU-GLY-THR-TYR
e.
ASP-VAL-TYR-LEU-GLY-TYR-VAL-LEU - Correct Answers -b.
MET-GLY-SER-LEU-CYS
All the cell's expressed RNAs are collectively referred to as the cell's
a. genome.
b. transcriptome
c. proteome.
d. holoenzyme.
e. ORF. - Correct Answers -b. transcriptome
Codons and anticodons
