Alternative removal of exons from mRNA is important in which of the following? a

Question

Alternative removal of exons from mRNA is important in which of the following? a. Troponins and other contractile proteins. b. Different types of collagen. c. The disease lupus. d. Alzheimer's disease. e. All of these. The enzyme principally responsible for RNA synthesis in Escherichia coli a. is a multisubunit enzyme b. consists of a single polypeptide chain c. requires Mn^2+ for activity d. requires a DNA primer Which of the following correctly describes a difference between RNA & DNA polymerases? a. RNA polymerases usually do not need a template, while DNA polymerases do. b. DNA polymerases usually require a primer (i.e., they can only continue a strand, not start one), while most RNA polymerases do not. c. RNA polymerases usually synthesize introns, while DNA polymerases synthesize cistrons. d. RNA polymerases polymerize 5' rightarrow 3', while DNA polymerases polymerize 3' rightarrow 5'. e. None of these Which of the following is not part of the core promoter? a. the transcription start site b. the Pribnow box (-10 region) c. the -35 region d. the UP element The end of the new mRNA molecule in E. coli. usually terminates in a string of A's a. True b. False In prokaryotic RNA synthesis a. the rate of incorporation of nucleotides is constant throughout the elongation process b. the rho (rho) protein is always required for termination c. a unique series of three bases leads to termination d. inverted-repeat sequences in the DNA being transcribed can lead to termination Which of these terms does not describe the DNA strand used to direct RNA synthesis? a. Template strand b. Coding strand c. Antisense strand d. Negative or "-" strand e. All these terms describe the DNA strand used to direct RNA synthesis

Explanation / Answer

Answer:

7. (e) All of these

8. (a) is a multisubunit enzyme

9. (b) DNA polymerases usually require a primer (i.e., they can only continue a strand, not start one), while most RNA polymerases do not.

Explanation:

DNA polymerase don't have the ability to start DNA polymerization and require a free 3-hydroxyl group already base-paired to the template.

10. (d) the UP element

Explanation:

Core promoter is the minimal portion of the promoter required to properly initiate transcription.

11. (b) False

Explanation:

Eukaryotic mRNAs terminates with a series of A's which prokaryotic mRNAs lack A's.

12. (d) inverted-repeat sequences in the DNA being transcribed can lead to termination

Explanation:

Inverted repeats in the DNA sequence being transcribed can lead to an mRNA molecule that forms a hairpin loop which acts a terminators.

13. (b) Coding strand

Explanation:

Coding strand is the strand of DNA that does not code for anything and is similar in sequence to the mRNA, except T instead of U.

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