What does the following phrase mean? Explain “It is as though the operon has both an...
What does the following phrase mean? Explain
“It is as though the operon has both an on-off switch and a volume control.”
Homework Answers
The operon is the short form of the operating unit. It contains many genes like genes for promotor, operator, regulator and structural genes. Thus it has on and off mechanisms. For example in lac operon, if there is lactose available in the medium then enzymes of lac operon has to be synthesized to metabolize it and in the absence of lactose or presence of glucose lac operon comes in off position. Thus Two regulators turn the operon "on" and "off" in response to lactose and glucose levels: the lac repressor and catabolite activator protein (CAP).
Also when there is a sufficient amount of lactose present in the medium the volume of the structural enzymes is also increased to metabolize it.
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