quiz8 - Biol241, Quiz 8 3/12/2010 1) A mutation in the gene...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Biol241, Quiz 8 3/12/2010 1) A mutation in the gene for the yeast regulatory protein GAL4 causes yeast to grow poorly on galactose. What is the function of GAL4? a) It is a substrate that binds and activates a transcriptional activator. b) It is a transcription activator for the galactose-digesting enzyme gene. c) It is a transcription repressor that prevents expression of yeast galactose- digesting enzymes. d) It is an enzyme that metabolizes galactose. 2) siRNAs and miRNAs are produced by a) The cleavage of RISCs by endonucleases. b) The cleavage of functional mRNA within the cytoplasm. c) The cleavage of pre-mRNA in the nucleus. d) The cutting and processing of double-stranded RNA by Dicer enzymes. 3) miRNAs usually inhibit gene expression by a) Causing RNA degradation via its binding to the target mRNAs. b) Methylating DNA via the recruitment of methyltransferase to specific DNA sites. c) Inhibiting translation via its binding to the 3’ UTRs of the target mRNAs.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

quiz8 - Biol241, Quiz 8 3/12/2010 1) A mutation in the gene...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online