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.

hi~~

i would say that hybridization occurs frequently in nature, because there are many types of hybrids that have occurred naturally, such as the mule (male donkey + female horse)

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.