Which of the following statements are true?
a) operons control the activity of an enzyme
b) operons control of the synsthesis of an enzyme
c) both operons and feedback inhibition control the synthesis of an emzyme
d) operons can induce or imate enzyme synthesis but can not repress enzyme synthesis

C

Explanation:

The operon is a constitution of genes transcribed together – hence developing a functional element to the cell -and have an operator and regulatory gene within it. The activity of the operon is regulated by a positive and negative feedback mechanism that is a response to the cells environment. An activator or a repressor molecule activates or represses, respectively, the transcription of the operon.

i'd say that the moon rock is about 2.2 billion years old.

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