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Terms in this set (29)
The tryptophan operon is a repressible operon that is
turned off whenever tryptophan is added to the growth medium
Which of the following is a protein produced by a regulatory gene
The cyclic AMP and lactose levels are both high within the cell
Transcription of the structural Gene's in an inducible operon
starts when the pathway's substrate is present
Which of the following occurs when the lactose enters the cell
Allolactose binds to the repressor protein.
If you were to observe the activity of methylated DNA, you would expect it to
have turned off or slowed down the process of transcription
genomic imprinting, DNA methylation, and histone acetylation are all examples of
In eukaryotes general transcription factors
bind to other proteins or to a sequence element within the TATA box.
gene expression might be altered at the level of post transcriptional processing in eukaryotes rather than prokaryotes because of
Eukaryotes exons may be spliced in alternative patterns
If she moves the promoter for the lac operon to the region between the beta galactosidase gene and the permease gene, which of the following would be likely?
Beta galactosidase will not be produced
If she moves the operator to the far end of the operon (past the transacetylase gene), which of the following would likely occur when the cell is exposed to lactose?
The structural genes will be transcribed continuously
Which of the following is an example of post transcriptional control of gene expression
the removal of introns and alternative splicing of exons
What would occur if the repressor of an inducible operon were mutated so it could not bind the operator?
Continuous transcription of the operon's genes
If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then
the amino acid acts as a corepressor
The lactose operon is likely to be transcribed when
the cyclic AMP and lactose levels are both high within the cell
Which of the following characteristics, structures, or processes is common to both bacteria and viruses?
Genetic material composed of nucleic acid
A human pandemic is
an epidemic that extends around the world
The host range of a virus is determined by
the proteins on its surface and that of the host
Which of the following accounts for someone who has had a herpesvirus mediated cold sore or genital sore getting flare ups for the rest of their life
copies of the herpesvirus genome permanently maintained in host cell cytoplasm
Which of the following is characteristic of the lytic cycle
A large number of phages is released at a time.
A researcher loses a cell that contains nucleic acid molecules and capsomeres of tmv. The cell contents are left in a covered test tube overnight. The next day this mixture is sprayed on tobacco plants. Which of the following would be expected to occur
The plants would develop the typical symptoms of tmv infection
Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
What is the function of reverse transcriptase in retroviruses
It uses viral RNA as a template for DNA synthesis.
Why do RNA viruses appear to have higher rates of mutation?
Replication of their genomes does not involve proofreading.
Which of the following can be effective in preventing the onset of viral infection in humans
Antiviral drugs that have become useful are usually associated with which of the following properties.
Interference with viral replication
A mutation that inactivates the regulatory gene of a repressible operon in a e coli cell would result in
A continuous transcription of the structural gene controlled by that regulator
For a repressible operon to be transcribed, which of the following must occur?
RNA polymerase must bind to the promoter, and the repressor must be inactive
If the yellow mottle virus capsid has 20 facets, how many proteins from each facet
If scientists are trying to use what they know about HSV to devise a means of protecting other people from being infected, which of the following would have the best chance of the lowering the number of new cases of infection
Interference with new viral replication in preexisting cases.
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