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Transcription and Regulation

Transcription and Regulation
Each tRNA molecule has a cloverleaf secondary structure consisting of

two stem loops
four stem loops
either (a) or (b)
three stem loops

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

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

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Transcription and Regulation
Rho-dependent termination of transcription in E. coli

both (a) and (b)
removes mRNA and holoenzyme from the DNA
requires ATP
requires about 50 nucleotides of uncomplexed mRNA

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Transcription and Regulation
Transcription results in

complementary DNA
an amino acid chain
Okazaki fragments
messenger RNA

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Transcription and Regulation
Upstream regions which are essential for correct transcription are called

start codons
promoters
enhancers
transcription factors

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Transcription and Regulation
The RNA polymerases that transcribe bacterial DNA are

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

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