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Transcription and Regulation

Transcription and Regulation
Promoters for tRNAs are located

none of these
upstream from the start codon
downstream from the start codon
both (a) and (b)

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Transcription and Regulation
The RNA polymerases that transcribe bacterial DNA are

only active inside the cell
interchangable with DNA polymerases
highly glycosylated in their active forms
multisubunit enzymes

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Transcription and Regulation
In eukaryotes, there are three different RNA polymerases. The RNA polymerase responsible for transcription of mRNA is

RNA polymerase I
RNA polymerase III
RNA polymerase II
none of these

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Transcription and Regulation
The closed complex at bacterial promoters is

not affected by activator proteins
bound more tightly when repressors are present
not affected by promoter mutations
in equilibrium with free RNA polymerase and the promoter

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Transcription and Regulation
The binding of lac repressor to DNA could be considered to be analogous to

mixed-type inhibition of an enzyme
competitive inhibition of an enzyme
allosteric effects in enzyme regulation
uncompetitive inhibition of an enzyme

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Transcription and Regulation
Which of the following is necessary for transcription to occur?

DNA molecule
DNA polymerase
Both DNA & RNA polymerase
RNA polymerase

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