Gene Regulation and Cancerkey-1

Gene Regulation and Cancerkey-1 - Gene Regulation and...

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Gene Regulation and Cancer 1. Operons a. are common in eukaryotes. b. consist of structural genes only. c. consist of a promoter, an operator, and two (or more) structural genes. d. consist of a promoter, an operator, structural genes, and a repressor gene. e. include inducer genes. 2. The expression of the lac structural genes is _______ when lactose is absent from the culture medium and is _______ when lactose is added because lactose binds to the _______ and inactivates it. a. low; high; lac repressor b. high; low; lac inducer c. low; high; lac promoter d. high; low; lac operator e. low; high; lac operator 3. Prokaryotes and eukaryotes differ in transcription in that a. there are three RNA polymerases in eukaryotes. b. initiation of transcription is simpler in prokaryotes. c. structural genes for a pathway are more likely to be clustered in prokaryotes. d. eukaryotic promoters have a TATA box. e. All of the above 4. DNA methylation a. is important in the development of mammalian embryos. b. may repress the transcription of genes. c. can play a role in some cancers. d. is abundant in promoters. e. All of the above 5. Which of the following mechanisms of posttranscriptional regulation of gene expression can produce several different proteins from a single gene? a. MicroRNAs
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This note was uploaded on 02/09/2012 for the course BIOLOGY 102 taught by Professor Anderson during the Spring '11 term at Harvard.

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Gene Regulation and Cancerkey-1 - Gene Regulation and...

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