Chapter 8 - Tpsnphospholipidsfluid urgid proteins...

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cholesterol Extracellular fluid carbohydrates proteins phospholipids flaccid Turgid (normal) plasmolyzed shriveled normal lysed AP Biology Name _Adeesh Jain_____________ Chapter 8 Guided Reading Assignment 1. What does selective permeability mean and why is that important to cells? Selective permeability means that some substances can cross a cell membrane easier than others, or cannot. This is important to cells because a cell does not want anything that does not belong in it to enter. Selective permeability allows only wanted substances in, and unwanted ones out. 2. What is an amphipathic molecule? An amphipathic molecule has both a hydrophilic (affinity for water) and a hydrophobic (no affinity for water) part. Phospholipids have a hydrophilic head and hydrophobic tails. Most membrane lipids are amphipathic. Proteins are also this way. 3. How is the fluidity of cell membrane’s maintained? The fluidity of a cell membrane is maintained by lateral movement. Phospholipids drift laterally, and very rapidly. This causes the fluidity of the membrane, and when temperatures get cooler, the fluidity decreases as the lateral movement is also decreased. Label the diagram below – for each structure – briefly list it’s function: 4. List the six broad functions of membrane proteins. Transport Enzymatic activity Signal transduction Intercellular joining Cell-cell recognition Attachment to the cytoskeleton and extracellular matrix (ECM) 5. How do glycolipids and glycoproteins help in cell to cell recognition? Glycolipids are oligosaccharides (polysaccharides therefore carbohydrate) that
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Chapter 8 - Tpsnphospholipidsfluid urgid proteins...

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