Fill in the blank: Very long and large organic molecules called are made of small
units called . Examples of the small units include sugars, which combine
to form ; nucleotides, which form ; and amino acids,
which form .

where is the scientific experiment?

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.