311C F09 Worksheet_13+A - NAME _ Discussion Worksheet #13...

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NAME ________________________________ Bio 311C F09 Discussion Worksheet #13 Gene Regulation 1. Transcription and translation are typically coupled in prokaryotes. Explain what this means. Why is this possible in prokaryotes and not eukaryotes? Translation of an mRNA can begin while the mRNA is still being transcribed (as soon as 5’ end & start codon are released from RNA Pol); simultaneous transcription & translation of same gene. Prokaryotes lack a nucleus. Eukaryotes have a nucleus so that 2. Describe the structure of a typical operon. How many genes are found in an operon? An operon contains an operator, a promoter, and the genes controlled by this operator & promoter. The number of genes found in an operon can vary. 3. What is an inducible operon? A repressible operon? Inducible: usually ‘off’ (transcription), but can be induced (transcription turned ‘on’). [lac operon] Repressible: usually ‘on’ (transcription), but can be repressed (transcription turned ‘off’). [trp operon] 4. What is the function of the trp operon? The trp operon contains the genes that code for the enzymes involved in the production of tryptophan. When the trp operon is ‘on’, these genes are expressed and tryptophan is produced. 5.
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This note was uploaded on 12/11/2009 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas at Austin.

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311C F09 Worksheet_13+A - NAME _ Discussion Worksheet #13...

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