Cell wall noun
the stiff outer coating of plant, fungi and bacteria
cells.
Cells
CANCEL
Vocab C
Write a sente
Use this word in a sentence or give an
example to show you understand its meaning

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 solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.