Chapter 5 - Post-Test - Biological Membranes

Chapter 5 - Post-Test - Biological Membranes - , a takes in...

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Purav Patel Chapter 5 AP Biology Biological Membranes Post-Test 1. Biological membranes are composed of amphipathic lipids, have hydrophobic tails and hydrophilic heads, are typically in a fluid state, and function in signal transduction . 2. According to the fluid-mosaic model, cell membranes consist of a fluid phospholipid bilayer in which proteins are embedded . 3. Transmembrane proteins extend completely through the membrane. 4. The plasma membrane transports materials, aids in structurally linking together cells, anchors the cell to the extracellular matrix, and has receptors that relay signals. 5. Active transport requires the cell to expend metabolic energy directly from ATP. 6. Facilitated Diffusion is an example of carrier-mediated transport. 7. The pumping of sodium-potassium pumps is an example of carrier-mediated active transport . 8. The patch-clamp technique allows researchers to study single ion channels . 9. In pinocytosis
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Unformatted text preview: , a takes in dissolved materials by forming tiny vesicles around fluid droplets trapped by folds of the PM. 10. When plant cells are in a hypotonic medium, they build up turgor pressure. 11. After a ligand binds to receptors in a coated pit, a coated vesicle forms by endocytosis. 12. In signal transduction, an extracellular signal is converted into an intracellular signal and a signal is relayed through a series of molecules in a membrane . 13. When a ligand binds with a receptor , it activates the receptor . 14. G proteins relay a message from the activated receptor to an enzyme that activates a second messenger. 15. Anchoring junctions that hold cells together at one point are desmosomes. 16. Junctions that permit the transfer of water, ions, and molecules between adjacent plasma cells are plasmodesmata. 17. Junctions that help form the blood-brain barrier are tight junctions . 1...
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