Consider the drawing in figure 438 What will happen if inste

Consider the drawing in figure 4-38. What will happen if, instead of the indicated feedback, feedback inhibition from Z affects the step B rightarrow C only? feedback inhibition from Z affects the step Y rightarrow Z only? Z is a positive regulator of the step B rightarrow X? Z is a positive regulator of the step B rightarrow C?

Solution

ANS: 2. Fee back inhibition from Z affects the step Y and Z only.

Explanation:

In this diagram Z inhibits its own synthesis by inhibiting between the B and X intermediate steps.

When there are enough products at the end of a pathway, then the enzymes of that pathway inhibit its own synthesis by interacting with enzymes in the synthesis pathway.

Ex: The enzyme hexo kinase which present in the glycolysis pathway of glucose is strictly regulated by its intermediate products. When glucose concentration is high glucose 6 phosphate inhibits its own synthesis.