AS Quiz08 2007-2 CH385

AS Quiz08 2007-2 CH385 - CH385 Introduction to Cell Biology...

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CH385 Introduction to Cell Biology Name _________________________ Quiz #8 (30 points) AY 2007-2 MULTIPLE CHOICE: 1. (4 pts) What is an operon? a. A series of genes found on different chromosomes. b. A series of enzymes that are transcribed as a single mRNA in prokaryotes. c. A series of alleles with minor variations in DNA sequences. d. A play by Gilbert and Sullivan. 2. (4 pts) Constitutive enzymes are a. always expressed in a cell. b. repressed by the presence of a repressor molecule. c. transcribed in the presence of an activator molecule. d. silent genes which have been inactivated by an insertion sequence. 3. (4 pts) Which of the following in NOT a difference between transcription in prokaryotes and eukaryotes? a. Eukaryotes have multiple RNA polymerases. b. RNA is synthesized in the 5’ to 3’ direction. c. Eukaryotes require general transcription factors. d. Regulatory genes in eukaryotes can be far away from the gene they control. 4. (4 points) An activator is?
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AS Quiz08 2007-2 CH385 - CH385 Introduction to Cell Biology...

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