Questions
Lac repressor can bind to
a
only lac operator
b
only beta galactosidase
c
lactose only
d
both operator and lactose.
detailed solution
Correct option is D
Lac repressor is an allosteric protein. It can reversibly bind to both operator (DNA sequence) and to the disaccharide lactose. It has operator binding site and lactose binding site. When bound to lactose, it shows conformational change at the operator binding site and can not bind to or detach from operator. In lactose free conditions, it can bind to operator to prevent transcription of structural genes cluster.Talk to our academic expert!
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Number of regulatory and structural genes present in lac operon are
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