Chapter 6, Problem 7TYU

DRAW IT Using a series of arrows, draw the branched metabolic reaction pathway described by the following statements. Then answer the question at the end. Use red arrows and minus signs to indicate inhibition.

L can form either M or N.

M can form O .

O can form either P or R.

P can form Q .

R can form S.

O inhibits the reaction of L to form M.

Q inhibits the reaction of O to form P.

S inhibits the reaction of O to form R.

Which reaction would prevail if both Q and S were present in the cell at high concentrations?

1. A.    L → M
2. B.     M → O
3. C.     L → N
4. D.    O → P