MICR 803 Study Guide - Quiz Guide: Sigma Factor, Consensus Sequence, Central Dogma Of Molecular Biology

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bronzefly406

15 Nov 2018

School

University of Kansas

Department

Micro, Molecular Gen & Immun

Course

MICR 803

Professor

Ben

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Document Summary

The central dogma of molecular biology describes the two-step process, transcription and translation, by which the information in genes flows into proteins: Operon: a set of genes transcribed under the control of an operator gene. Elongation: creation of the mrna transcript and addition of nucleotides. Termination: stopping transcription, sequence at the end of gene releases the rna polymerase. Promoter is an on and off switch for transcription not part of the mrna (upstream of the coding strand) Rna polymerase: holoenzyme: the core and sigma factor. Two alpha subunits, beta, beta prime and omega subunit. Only the core is require for the elongation phase (not omega) The sigma factor is for initiating transcription: helps rna know where to start transcription. Regulons: operons that are regulated at same time by the same control proteins (the sigma factor) at different locations on the chromosome.

Related Questions

Which type of RNA is unique to eukaryotes?

		mRNA
		rRNA
		tRNA
		snRNA
		Its a trick, all cells have all four types of RNA.

1 points

QUESTION 2

The region of DNA to which RNA polymerase binds to initiate transcription is the:

		origin
		promoter
		enhancer
		none of the above are correct

1 points

QUESTION 3

Holoenzyme:

		is RNA polymerase core enzyme.
		is sigma factor.
		is core plus sigma factor.
		none of the above are correct.

1 points

QUESTION 4

Which of these is formed FIRST when RNA polymerase binds to a promoter?

		The closed promoter complex
		The open promoter complex
		A rho-independent terminator
		none of the above are correct.

1 points

QUESTION 5

A hairpin loop followed by a run of Us:

		is the sequence formed in the sense strand of a gene using a rho-independent terminator.
		is the sequence recognized by the rho protein.
		is the structure formed in RNA that causes rho-independent termination.
		is formed immediately after the open promoter complex is formed.

1 points

QUESTION 6

RNA polymerase:

		reads the template strand of the DNA in the 3' to 5' direction.
		synthesizes the RNA in the 5' to 3' direction.
		can begin transcription without a primer.
		all of the above are correct.

1 points

QUESTION 7

Which of the following statements is FALSE?

		Bacteria like E. coli have only one type of sigma factor.
		RNA polymerase has no proofreading activity.
		The promoter of a gene is upstream of the RNA-coding region.
		Bacterial transcriptional terminators are copied into RNA to cause termination.

1 points

QUESTION 8

If the template strand of a gene has the sequence 5' ATGCGAT 3', then:

		the RNA produced will have the sequence 5' AUGCGAU 3'.
		the RNA produced will have the sequence 5' UAGCGUA 3'.
		the RNA produced will have the sequence 5' AUCGCAU 3'.
		None of the above are correct.

1 points

QUESTION 9

The sense strand:

		is the lagging strand
		is also the template strand.
		always goes left to right.
		none of the above are correct.

1 points

QUESTION 10

Which of these is transcribed but not translated?

		mRNA
		tRNA
		rRNA
		all of the above
		tRNA and rRNA are transcribed but not translated.

please help i am a bit confused

MICR 803 Study Guide - Quiz Guide: Sigma Factor, Consensus Sequence, Central Dogma Of Molecular Biology

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