1.Comparing mRNA molecules from human and E. coli cells, which of the following is not typically true?
A. A human mRNA has a special 5' cap, while bacterial mRNA does not.
B. A human mRNA has a poly-A tail, while a bacterial mRNA does not.
C. A typical human mRNA encodes one protein, while many bacterial mRNAs encode several different proteins.
D. All of the above are true.
2. Which of the following is FALSE regarding eukaryotic transcription?
a.RNA polymerases (along with its sigma factor) can initiate transcription on its own.
b. RNA polymerase requires the general transcription factors to assemble at the promoter before polymerase can begin transcription.
c. TFIID along with TATA binding protein is required for initiation of transcription.
d. RNA polymerase must be phosphorylated at its C-terminal tail for transcription to proceed.
3. Eukaryotic pre-mRNAs undergo a number of modifications such as capping at the 5' end. A 5' cap _____.
a.Consists of a modified terminal adenine nucleotide.
b. Consists of a string of modified adenines.
c. Consists of a methylguanosine added to the 3' end.
d. Consists of a methylguanosine added to the 5' end.
1.Comparing mRNA molecules from human and E. coli cells, which of the following is not typically true?
A. A human mRNA has a special 5' cap, while bacterial mRNA does not.
| B. | A human mRNA has a poly-A tail, while a bacterial mRNA does not. | ||||||||||||||||||||||||||||
| C. A typical human mRNA encodes one protein, while many bacterial mRNAs encode several different proteins. | |||||||||||||||||||||||||||||
| D. All of the above are true. 2. Which of the following is FALSE regarding eukaryotic transcription?
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Related questions
| 1. | What are the three processes in post-transcriptional processes that must be completed before transcripts can be translated in eukaryotes? | ||||||||||
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| 2. | Which of the following key differences between prokaryotic and eukaryotic transcription are TRUE? Check all that apply. | ||||||||||
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Please help on these. Thank you!
Question 1
Which of the following is NOT a channel in the RNA polymeraseenzyme?
RNA exit channel | ||
DNA entry channel | ||
DNA exit channel | ||
Nucleotide exit channel |
Question 2
A promoter region upstream of a bacterial gene typically has thesequence TTGACA in the -35 position and TATAAT in the -10 position.If there was a 5 bp insertion at the -40 position, such thateverything downstream was shifted (ie: the "-35 element" is now atthe -30 from the transcription start site), which of the followingwill occur?
Sigma protein will not bind and so no transcription willoccur. | ||
RNA polymerase will not bind and so no transcription willoccur. | ||
Sigma protein will bind to its target sequences and sotranscription will start 5bp downstream from the originaltranscription start site. | ||
Sigma protein will bind as usual and transcription will startappropriately at the transcription start site. |
Question 3
A person has a mutation that prevents TFIIH from being produced.Which of the following outcomes will occur?
No transcription because TFIID will not be able to bind. | ||
No transcription because the DNA strand will not be opened. | ||
Transcription will occur, but it will not be in the correctposition. | ||
Transcription will occur as usual. |
Question 4
There are 4 rRNAs produced to make both subunits of theribosome. How many transcripts are required to produce these 4rRNAs?
1 | ||
2 | ||
3 | ||
4 |
Question 5
True or False: the 5' 7m-Gppp cap is attached to the start codonof the mRNA.
True. | ||
False, the cap is attached to the 5'-untranslated region. | ||
False - the cap is attached to the 3'-untranslated region. | ||
False, the cap is attached to the polyA tail. |
Question 6
During the splicing mechanism, which of the following joins twoexons together?
A 2'OH attacks a 5' phosphate | ||
A 5' phosphate attacks a 2'OH | ||
A 3'OH attacks a 5' phosphate | ||
| A 5' phosphate attacks a 3'OH Question 7 After their experiment in Neurospora, Beadle and Tatum concludedthat each single genes code for single enzymes. Do you agree withtheir statement, why or why not? |
