The committed step in steroid biosynthesis from cholesterol is
A) cholesterol esterase conversion of cholesterol ester to free cholesterol.
B) conversion of cholesterol to pregnenolone.
C) the P450 dependent 21-hydroxylation of progesterone.
D) the 17-hydroxylation of pregnenolone to 17-alpha-hydroxypregnenolone.
E) None of the above.
Correct Answer:
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