The six carbon molecule that is the first one synthesized in kreb's cycle is?
a) atp
b) pyruvate
c) acetyl-coa (acetate)
d) citrate
e) alpha ketogluterate

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

the answers are a and c