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Regulation of lac operon by repressor is...

Regulation of lac operon by repressor is called

A

Positive regulation

B

Negative regulation

C

Both 1 or 2

D

None

Text Solution

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The correct Answer is:
B
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Assertion :- Regulation of lac operon by repressor is referred to as positive regulation. Reason : Regulation of lac operon can also be visualized as regulation of enzyme synthesis by its product.

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Lac operon is

Read the following statements w.r.t. lac operon. a. lac-i is the constitutive gene. b. lac-y codes for permease to increase permeability of cell to Beta -galactoside. c. Lactose is the substrate for the enzyme B- galactosidase and it regulates switching on and off of the operon. d. Regulation of lac operan can be also visualised as regulation of enzyme synthesis by its substrate.

Repressor of lac-operon

Assertion :- Lactose is the substrate for the enzyme beta -galactosidase & it regulates switching on & off of the operon. Reason: A very low level of expression of lac operon is always present in cell all the time.

Which of following statement is true for lac operon in E-coli (a) lac operon consists of one regulatory gene and five structural gene. (b) The i gene codes for inducer (c) The z-gene codes for beta -galacosidase (d) A very low level of expression of lac operon has to be present in cell all the time

Inducer of Lac operon is