The bag is made of a celluloid material that is permeable to water but not to sugar or salt. At the same time another solute, Solute B, is transported through the same protein in the same direction but Solute B is carried against its concentration gradient. A pit forms on the plasma membrane. The inner layer of the pit membrane is coated with protein making it look fuzzy. The outer layer of the pit membrane has specific receptor proteins showing.
Ligands bind to the receptors.
Then the fuzzy layer of proteins works to close off the pit making it a coated vesicle inside the cell. The sodium-potassium pump is an electrogenic pump. Study the cell diagram on screen. 19. is most similar to a gap junction in an animal cell 20. is a multipurpose structure in that it can store proteins as in seeds, inorganic ions such as potassium or chloride, pigments which color flowers, or even poisons to protect the plant. Enough of the diagram, now name the organelle that is malfunctioning when a person has Pompe's disease.