Explain what properties of membrane lipids allows this to occur without energy expenditure. Fluorescence microscope 8. Circle all answers that are correct. HCO 3 - 10. Some older models for membrane transport suggested that a protein would bind to a solute outside the cell, followed by a rotation of the transport protein like a revolving door, so the solute could be released inside the cell.
Ion channels are usually closed and open only in response to specific stimuli.
Give two examples of stimuli which can cause ion channels to open. Negatively charged ions, such as Cl - , are concentrated in the extracellular fluid. Eukaryotic cells possess a substantial amount of internal membrane. We discussed three general types of intracellular protein transport. Fill in the table below with specific examples of the cellular compartments that use the pathways listed.