Biology 1002B Lecture Notes - Lecture 11: Lac Repressor, Stem-Loop, Prokaryotic Translation

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goldmallard877

9 Dec 2011

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Introns:

A: are frequently present in prokaryotic genes but are rare in eukaryotic genes.

B: are spliced out before transcription.

C: are translated but not transcribed.

D: can occur many times within a single gene.

E:encode unusual amino acids in proteins.

What are the three processes in post-transcriptional processes that must be completed before transcripts can be translated in eukaryotes?

A.	Binding of snRNPs, addition of a poly A tail, splicing of introns
B.	Binding of snRNPs, transporting, synthesizing of ribose
C.	Capping, transporting, synthesizing of ribose
D.	Binding of snRNPs, capping, splicing
E.	Capping, splicing, addition of a poly A tail

Which of the following key differences between prokaryotic and eukaryotic transcription are TRUE? Check all that apply.

	A. prokaryotic transcription occurs in the cytoplasm, while eukaryotic transcription occurs in the nucleus
	B. eukaryotic transcription is carried out by 1 RNA polymerase, while prokaryotic transcription is carried out by 3 different RNA polymerases
	C. eukaryotic transcripts are processed, while prokaryotic transcripts are translated while transcription is still occurring
	D. prokaryotes have sigma factors for specificity of binding whereas eukaryotes have multiple general transcription factors
	E. prokaryotes have to worry about unpackaging the DNA for transcription, while eukaryotes have almost naked DNA not bound up by nucleosome

whitehippopotamus545

If E. coli encounter an environment that is LOW in the concentration of glucose and the concentration of lactose, which of the following scenarios would result?

A) lac repressor is not bound to the operator, CAP is bound to the CAP binding site, and there is active transcription of the lac operon

B) lac repressor is bound to the operator, CAP is bound to the CAP binding site, and there is no transcription of the lac operon

C)lac repressor is not bound to the operator, CAP is not bound to the CAP binding site, and no transcription of the lac operon

D) lac repressor is not bound to the operator, CAP is bound to the CAP binding site, and there is no active transcription of the lac operon

emeralddolphin352

Biology 1002B Lecture Notes - Lecture 11: Lac Repressor, Stem-Loop, Prokaryotic Translation

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