Transcript The Biotechnology Century and Its Workforce

Active Lecture
Questions
Chapter 8
Microbial Genetics
Copyright © 2010 Pearson Education, Inc.
Transfer of DNA from a donor to a
recipient cell by a bacteriophage.
a.
b.
c.
d.
e.
conjugation
transcription
transduction
transformation
translation
Transfer of DNA from a donor to a
recipient as naked DNA in solution.
a.
b.
c.
d.
e.
conjugation
transcription
transduction
transformation
translation
Feedback inhibition differs from
repression because feedback inhibition
a.
b.
c.
d.
e.
is less precise.
is slower acting.
stops the action of preexisting enzymes.
stops the synthesis of new enzymes.
all of the above
Bacteria can acquire antibiotic resistance
by all of the following except
a.
b.
c.
d.
e.
mutation.
insertion of transposons.
conjugation.
snRNPs.
transformation.
Suppose you inoculate three flasks of minimal salts
broth with E. coli. Flask A contains glucose. Flask B
contains glucose and lactose. Flask C contains
lactose. After a few hours of incubation, you test the
flasks for the presence of -galactosidase. Which
flask(s) do you predict will have this enzyme?
a.
b.
c.
d.
e.
A
B
C
A and B
B and C
Plasmids differ from transposons
because plasmids
a.
b.
c.
d.
e.
become inserted into chromosomes.
are self-replicated outside the chromosome.
move from chromosome to chromosome.
carry genes for antibiotic resistance.
none of the above
Mechanism by which the presence of
glucose inhibits the lac operon.
a.
b.
c.
d.
e.
catabolite repression
DNA polymerase
induction
repression
translation
The mechanism by which lactose
controls the lac operon.
a.
b.
c.
d.
e.
catabolite repression
DNA polymerase
induction
repression
translation
Two daughter cells are most likely to
inherit which one of the following from the
parent cell?
a.
b.
c.
d.
e.
a change in a nucleotide in mRNA
a change in a nucleotide in tRNA
a change in a nucleotide in rRNA
a change in a nucleotide in DNA
a change in a protein
Which of the following is not a method of
horizontal gene transfer?
a.
b.
c.
d.
e.
binary fission
conjugation
integration of a transposon
transduction
transformation
A sequence of nucleotides in DNA that
codes for a functional product refers to
a(n)
a.
b.
c.
d.
Genetic code
DNA polymerase
induction
repression
In DNA replication, the newly added
nucleotide is joined to the growing DNA
strand by
a.
b.
c.
d.
DNA polymerase
RNA polymerase
DNA ligase
DNA gyrase
Which of the following enzymes joins DNA
strands and joins Okazaki fragments and new
segments in excision by forming covalent
bonds?
a.
b.
c.
d.
DNA polymerase
RNA polymerase
DNA ligase
DNA gyrase
What carries the coded information for
making specific proteins from DNA to
ribosomes?
a.
b.
c.
d.
mRNA
rRNA
tRNA
RNA polymerase
A group of three nucleotides is
called a(n)
a.
b.
c.
d.
Codon
Anticodon
Exon
Intron
Of the 64 codons, how many are sense
codons?
a.
b.
c.
d.
48
60
61
52
Perhaps 60–80% of genes are not
regulated, but are
a.
b.
c.
d.
Constitutive
Continuous
Degenerative
Repressed
A set of operator and promoter sites and
the structural genes they control is
defined as
a.
b.
c.
d.
a corepressor
An operon
An inducer
cAMP
The regulation of the lactose operon
depends on the level of the following
substance in the medium:
a.
b.
c.
d.
DNA polymerase
RNA polymerase
Glucose
Galactose
Ionizing radiation causes
a.
b.
c.
d.
DNA to break
Bonding between adjacent thymines
Nitrogenous base substitutions
The formation of highly reactive ions
What is the most common type of
mutation involving single base pairs?
a.
b.
c.
d.
Frameshift mutation
Nonesense mutation
Missense mutation
Base substitution
Approximately what percentage of
substances found by the Ames test to be
mutagenic have been found to be
carcinogenic in animals?
a.
b.
c.
d.
85%
75%
95%
90%
A bacteriophage is involved in
a.
b.
c.
d.
Conjugation
Transduction
Transformation
Transcription
The process in which bacterial DNA is
transferred from a donor cell to a
recipient cell inside a bacteriophage is
called
a.
b.
c.
d.
Conjugation
Transduction
Specialized transduction
Transformation
What did Griffith’s experiment
demonstrate?
a.
b.
c.
d.
Conjugation
Transduction
Transformation
Transcription