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bio 1985

Essay specific features

 

Issue:

Science

 

Written by:

Joan W

 

Date added:

September 27, 2016

 

Level:

 

Grade:

A

 

No of pages / words:

1 / 186

 

Was viewed:

2297 times

 

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Essay content:

4 __ promoter site __ repressor site __ operator site __ structural genes __ inducer Function Max. 4 __ binds RNA polymerase* at 3' site on DNA (* also cAMP-CAP) __ produces repressor protein: stops RNA polymerase attaching to promoter __ site of attachment of repressor protein __ codes for sequential protein __ serves to inactivate repressor CONTROL OF mRNA PRODUCTION & CONSEQUENCES re PROTEIN SYNTHESIS: __ Inducible model: derepression (lactose example) [gene always off] = 3 points __ Repressible model: corepression (tryptophan-histidine) [gene always on] = 3 points __ CAP model: catabolite induction: with decrease in glucose -> increase in cAMP cAMP-CAP binds to promoter site therefore, transcription -> lactose metabolism = 3 points (above require explanation & example) __ Adaptive significance = 2 points __ Final fate of mRNA transcribed = 2 points Max...
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