Question

learning: chapter 03: sections 1-3
question
ions and other small water-soluble materials cross the plasma membrane only by
passing through _______.
answer
a channel
membrane anchors
a receptor protein
ligand
i dont know yet

Explanation:

Ions and small water - soluble molecules can't cross the non - polar lipid bilayer of the plasma membrane freely. Channel proteins form pores in the membrane that allow these substances to pass through via facilitated diffusion. Membrane anchors are for attaching proteins to the membrane, receptor proteins bind to signaling molecules, and ligands are molecules that bind to receptors. So the correct option is "a channel".

Answer:

a. a channel