Choose all the answers that apply. The cell membrane .

A.) is not a true organelle
B.) contains and protects the cell
C.) is made of a double layer of phospholipids
D.) contains proteins that allow materials to pass through

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.