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- 1. Multiple ChoiceWhich of the following are not components of the cell membrane?cell surface markerstransmembrane proteinsinterior protein networkplasmodesmata
- 2. Multiple ChoiceTo cross the cell membrane, water must _____.squeeze between phospholipid moleculespass through aquaporinsbe transported at the expense of ATPbe moved by a cotransport system
- 3. Multiple ChoiceThe sodium-potassium pump passes _______.more Na+ out than K+ inK+ out and Na+ in on a one-for-one basisNa+ out and K+ in on a one-for-one basisK+ and Na+ in the same direction
- 4. Multiple ChoiceExocytosis is a process by which cells _______.pass substances out of the cell in vesiclespass substances out of the cell through the membrane by osmosisrelease substances directly into the extracellular fluid through a porerelease substances directly into the extracellular fluid through a pit
- 5. Multiple ChoiceIn each cycle the sodium-potassium pumps transfer _______.two potassium ions in and two sodium ions outone sodium ion out and one potassium ion inthree sodium ions out and two potassium ions inone potassium ion out and two sodium ions in
- 6. Multiple Choice____________________ are transported by a particular carrier or pass through a particular channel.All water soluble ions or moleculesCertain water soluble molecules or ionsAll insoluble molecules or ionsCertain insoluble ions or molecules
- 7. Multiple ChoiceA lipid bilayer is held together by ______.surface tensiondouble bonds in their fatty acid tailsthe attraction of the phospholipid heads to each otherthe hydrogen bonding with water
- 8. Multiple ChoiceThe net movement of uncharged, polar molecules across a semipermeable membrane from a low concentration to a high concentration occurs by facilitated diffusion.TrueFalse
- 9. Multiple ChoiceATP is required in the transport of ________.water moleculesall molecules across a membranemolecules to areas of higher concentrationsmolecules to areas of lower concentrations
- 10. Multiple ChoiceThe methods of membrane transport that don't require protein channels or carriers areosmosisdiffusionexocytosisall of the above
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