What is relationship between poly (A) tail length and mRNAtranslation in eukaryotes?
(1) There is no relationship
(2) Poly (A) tails are involved in binding of mRNA to thetRNAs
(3) Long poly (A) tails impart shortened translation tomRNAs
(4) Long poly (A) tails impart lengthened translation tomRNAs
(5) There are no poly (A) tails in eukaryotic mRNAs, they areonly in prokaryotic mRNAs
What is relationship between poly (A) tail length and mRNAtranslation in eukaryotes?
(1) There is no relationship
(2) Poly (A) tails are involved in binding of mRNA to thetRNAs
(3) Long poly (A) tails impart shortened translation tomRNAs
(4) Long poly (A) tails impart lengthened translation tomRNAs
(5) There are no poly (A) tails in eukaryotic mRNAs, they areonly in prokaryotic mRNAs
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QUESTION 1
In the bacterial lac repressor, which of these occurs: (select all that apply)
| (a)In the presence of glucose and the absence of lactose, the repressor is actively produced. | ||
| (b)The lac operon can be hyper-induced in the presence of low glucose by the 'cAMP binding protein' (CAMP). | ||
| (c)In the presence of lactose and the absence of glucose the lac operon is repressed. | ||
| (d)Allolactose is a byproduct of β-galactosidase, indicating high lactose when it builds up. |
1.5 points
QUESTION 2
In eukaryotes the enhancer elements can be quite a distance upstream or downstream from the promoter, and transcriptional regulation is helped by protein:protein interactions.
True
False
1.5 points
QUESTION 3
The prokaryotic promoter contains a TATA box that is at -10bp upstream from the transcriptional start site.
True
False
1.5 points
QUESTION 4
During the addition of the poly A tail which of these occurs:(select all that apply)
| (a)The transcript is synthesized beyond the poly A site (AAUAAA). | ||
| (b)The mRNA contains a 5â cap. | ||
| (c)The transcript is cleaved 35nt downstream from the poly A site. | ||
| (d)An enzyme complex containing an exonuclease and polyadenylate polymerase cleaves nearby the AAUAA site. | ||
| (e)100-300 Aâs are added to the 5â end. |