1. Fill in the chart to define negative control and positive control in terms of

Question

1. Fill in the chart to define negative control and positive control in terms of how the active forms of the gene regulatory proteins function. How does an inducer turn on a gene that is negatively controlled? How does an inducer turn on a gene that is positively controlled? Explain how a product turns off a negatively controlled gene, and how it turns off a positively controlled gene. Provide an example of each. (4pt)

Type of control

Function of Inducer

Function of Product

Example

Negative

Positive

Type of control

Function of Inducer

Function of Product

Example

Negative

Positive

Explanation / Answer

Negative - function of inducer - the inducer bind to repressor which inhibit it binding it to operator thus on the gene .

Function of product - the product as the inhibitor of the gene which off the gene

Example lac operon

Positive - function of inducer - it bind to activator which activate activator to bind to dna . function of product - inhibit the gene and turn it off.

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