A necessary and essential feature of RNA polymerases is their
ability to home in to promoters...
A necessary and essential feature of RNA polymerases is their
ability to home in to promoters to initiate
transcription, and then transition to transcription elongation.
Explain the biological context of the above statement.
Describe briefly the structure and subunits of prokaryotic and
eukaryotic RNA polymerases. Describe in detail at least three ways
that prokaryotic and eukaryotic transcription differ from each
other.
Describe briefly the structure and subunits of prokaryotic and
eukaryotic RNA polymerases. Describe in detail at least three ways
that prokaryotic and eukaryotic transcription differ from each
other.
RNA polymerases interact with specific sections of the DNA
double helix in a genome. Mention how those DNA portions are called
and all you know about their structure. You will also mention which
other types of proteins interact with the DNA and RNA polymerase
and how they help control gene expression.
One way to discover promoters is through an experiment called
RNA polymerase protection assay, in which RNA polymerase binds to a
gene, is cross-linked to the DNA, and then the DNA is subjected to
fragmentation, which breaks apart any DNA that is not protected by
cross-linked protein. Explain why this would help to identify
promoters in genes.
QUESTION 38
Viral capsules are studded with
a. RNA polymerases
b. Reverse transcriptase
c. Proteins which bind to host cell surface proteins
d. Double-stranded DNA
2 points
QUESTION 39
The scientists who worked out the structure of DNA and received
the Nobel Prize for this discovery are:
a. Darwin and Newton
b. Hershey and Chase
c. Morgan, Griffith and Avery
d. Watson, Crick and Wilkins
2 points
QUESTION 40
The two strands of the DNA double helix are...
16. Which of the following polymerases do not have proof
reading ability?
a. DNA polymerase I
b. DNA polymerase II
c. DNA polymerase III
d. DNA polymerase a (alpha)
e. DNA polymerase d (delta)
17. Which of teh following may detect G:T mismatch in
bacterial genome?
a. exonuclease I
b. MutS
c. DNA polymerase III
d. Uracil DNA glycosidase
e. uvrABC excinuclease
18. Which of the following is the primary target of
ciprofloxacin?
a. DNA topoisomerase II (DNA gyrase)
b....
Eukaryotic cells produce three distinct RNA polymerases: pol I,
pol II, and pol III. Which of the following statements is NOT true
about eukaryotic RNA polymerases?
A) Pol II, with twelve subunits on its own, is capable of
initiating transcription.
B) Pol III is responsible for the transcription of all
tRNAs.
C) Pol I carries out the transcription of the 45S pre-rRNA
transcript.
D) Pol III is responsible for the transcription of ribosomal 5S
rRNA.
The ability of a mouse to recognize the odor of a potential
predator is essential to the mouse’s survival. Typically, the
source of these odors are major urinary proteins (Mups). 30% of lab
mice sells exposed to chemically produced cat Mups responded
positively (i.e. recognized the danger of the lurking predator).
Consider a sample of 100 lab mice cells, each exposed to chemically
produced cat MUPS. Let X represents the number of cells that
respond positively.
a) Explain why the...
1.
The RNA virus's ability to produce tumors is related to the
presence of_________?
2. ___________ cause release of cytokins, which cause fever,
nausea, and other symptoms; e.g., toxic shock syndrom toxin.
3. Invasive__________ streptococci cause severe and rapid
tissue destruction.