Genetics 4

RNA polymerase binds to the _______ of an operon

gene regulation is _______

to achieve adaptive regulation, a cell must sense ______ and transcribe only ______ gene products

allows transcription activator is present at binding site. default gene expression is off, special molecule turns on transcription

• positive regulation

• negative regulation

• cis acting molecules

• trans acting

transcription is on by default. transcription is prevented by repressor molecule at a binding site,

• positive regulation

• negative regulation

• cis acting molecules

• trans acting

regulatory molecule and binding site together represent a ________ ______

part of DNA whose nucleotides encode for a protein

• structural gene

• regulatory gene

• repressor gene

• regulatory molecule

characteristics of regulatory molecule

• protein

• dna

• encoded in genome

• can move around cell

• stationary

the regulatory site is

• stationary

• mobile

• DNA

• protein

a substance in the environment, an _______, may influence regulatory function by binding to allosteric sites of a regulatory molecule