Cell surface receptors used in cell signaling are usually proteins that extend from one side of the membrane to the other side of the membrane. what is the role of the extracellular part of the protein? A binding the signaling molecule
B afunctioning as an enzyme
C increasing the solubility of the receptor
D transmitting the signal from the target cell

Give the biological term for: structures that display characteristics of living organisms only within living cells

Which of the following is a difference between active transport and facilitated diffusion? view available hint(s)which of the following is a difference between active transport and facilitated diffusion? facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.active transport involves transport proteins, and facilitated diffusion does not.facilitated diffusion involves transport proteins, and active transport does not.active transport requires the expenditure of cellular energy, and facilitated diffusion does not.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks