Molecular biology ...6,7,8,9,10Qs - maryam2009

[ArchivalUser]

6.During peptide elongation, the charged tRNA is added at the
A. P site of the ribosome
B. A site of the ribosome
C. active site of the tRNA-aminoacyl synthetase
D. signal peptidase

7.Which of the following do not occur during post-transcriptional processing of RNA in eukaryotes?
A. the splicing of introns
B. addition of a poly-A at the 3' end
C. removal of introns
D. addition of a 7-methyl guanosine cap at the 5' end

8. During transcription, which strand is not read by the RNA polymerase?
A. coding strand
B. noncoding strand
C. template strand
D. terminator strand

9. The function of the rho protein is
A. to help terminate translation
B. to help RNA polymerase bind to the DNA
C. to help RNA polymerase find a promoter
D. to help terminate transcription

10.The unusual bases found in transfer RNAs
A. are added during transcription
B. are normal bases that have been modified after transcription
C. help the tRNAs to bind to DNA
D. ensure that the tRNA stays linear in solution

[ArchivalUser]

6) In the elongation...A site. So B
7) C, i believe you splice them by Snrp?
8) A? Coding strand is not read by
9)D
10) i've got no clue honestly...but i'd say D..just a guess

[ArchivalUser]

6.a
7.C
8.D
9.no c
10.B

[ArchivalUser]

6. B
7. A, or C??
8. B
9. D
10. B...

[ArchivalUser]

6, B
7, B
8, B
9, D
10, B?

[ArchivalUser]

6.A
7.C
8.A
9.D
10.B

[ArchivalUser]

The correct answers are:

6.B
7.A....the splicing of introns do occur during pre-RNA Transcript not post-transcript
8.A
9.D
10.B

[ArchivalUser]

maryam, can you explain question 7 please. I thought when DNA is transcribed it will enter the post-transcriptional process, like capping, splicing, and polyadenylation. But the question asks which does not occur, so I'm confused. Also, what is the difference between A and C?

[ArchivalUser]

sorry, forget about the first part of my question. I just want to know the difference between A and C

[ArchivalUser]

As I undrestand the process of splicing and removing of introns occur in 3 steps/phases respectively...first...primary pre-RNA transcript combins with snRNPs/snurps to form spilosome...(choice A),second is an intermediate step...Lariant shape/or loop is generated and the last/third step..removal of introns(choice C) and joing exons that occur at the post-transcriptional phase ando generate the mature mRNA.....then the mature mRNA is transported to the cytoplasm

for this reason I chose and posted this Q to know more about the process in details.
Thank you for bring it to discuss.

for more information Please look at this link.

http://highered.mcgraw-hill.com/olcweb/c...cess%20RNA