Chapter 5B Review Cell Membranes

The plasma membrane is: Impermeable permeable selectively permeable depermeable

Plasma membrane is a: Phospholipid bilayer phospholipid layer carbohydrate bilayer carbohydrate layer

Nonpolar end polar end hydrophobic end hydrophilic end Identify the structures A B A B

What would each be called? (next slide answers) E F

_____Phospholipid bilayer _____carbohydrate chain _____protein channel _____steroid (cholesterol) _____hydrophobic end _____hydrophilic end

The steroid (cholesterol) in the membrane helps to: Add bulk to the bilayer Stabilize the temperature of the bilayer Allow materials through the membrane act as identification tags

The carbohydrate chain in the membrane helps to: Add bulk to the bilayer Stabilize the temperature of the bilayer Allow materials through the membrane act as identification tags

If the binding of a messenger to a receptor protein triggers a chain reaction it is called: Osmoregulation hypocholesterolemia receptor-mediated endocystosis signal transduction

What type of molecules could pass freely through the plasma membrane? O 2 polar molecules glucose hormones

Which does “Down a concentration gradient” mean? Movement of molecules from high to low concentration Movement of molecules from low to high concentration Movement of molecules from equal to equal concentrations

A. facilitated diffusion B. exocytosis C. osmosis D. receptor-mediated endocytosis Which type are these? (no energy expended and note hi to low)

Explain differences: (next slide)

Which one... Uses energy to move molecules across membrane__________________ From Hi to Low concentration without expending energy________________ Hi to Low concentration without expending energy but uses a protein channel________________________

How is osmosis different than diffusion? Osmosis... A. Does not go from high to low concentration B. is the movement of water through a selectively permeable membrane C. is the movement of water through an impermeable membrane

Explain what is happening:

What does equilibrium mean? More of one solute on one side only water moves across membrane no net change in concentration of solutes on each side of the membrane

MATCHING Flaccid turgid plasmolysis lysing A. shrinkage of the plasma membrane from cell wall due to water loss B. water loss causes lack of pressure of cell membrane on cell wall C. pressure on cell wall D. breaking of cell membrane

Has water gone in or out of cell in each example? _______ ________ _______ water vacuolecell wall cell membrane water vacuole

Which red blood cells are in: Hypertonic solution hypotonic solution isotonic solution A B C

What has happened to this plant cell? Turgidity plasmolysis lysing

What is the channel protein that allows solute due to ions or size through called? -transport -enzyme -signal transduction

Channel proteins that are specific (in shape) to allow chemical signals from other cells in are called: -transport proteins -receptor proteins -chemical proteins

How are these different? (also see next slide)

Match Transport proteins Linkers enzymes receptors A-Attach to cytoskeleton B-speed up reactions C-relay signals in and out D-pump ions through membrane

Which is NOT a type of endocytosis? Pinocytosis receptor-mediated exocytosis phagocytosis

Which is NOT active transport? Osmosis Na-K pump Proton pumps- Chemiosmosis Receptor mediated endocytosis

Which is NOT passive transport? Osmosis endocytosis diffusion facilitated diffusion

*Receptor proteins bind to a specific molecule (hormone) due to its _________. Size shape polarity amount of water

What type of endocytosis? receptor- mediated pinocytosis phagocytosis

What happened? Water moved to hypertonic solution water moved to hypotonic solution solute moved to hypertonic solution

Hypercholesterolemia is a disease caused by: Too many LDL receptor proteins in the blood Too few LDL receptor proteins in the blood Too many HDL receptor proteins in the blood Too few HDL receptor proteins in the blood

MATCHING _____cell pooping A. pinocytosis _____cell drinking B. phagocytosis _____cell eating C. exocytosis