WS5KEY

WS5KEY - Worksheet Chapter 5 KEY pg1 of 3 Describe the...

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Worksheet Chapter 5 KEY pg1 of 3 Describe the properties of phospholipids and their arrangement in cellular membranes. Phospholipids have a polar (hydrophilic) head and non-polar (hydrophilic) tails. Membranes are a bi-layer of phospholipids molecules with the tails facing inwards and the heads on the outside. Describe the fluid properties of the cell membrane and explain how membrane fluidity is influenced by membrane composition. Because the membrane is held together by relatively weak hydrophobic interactions, the lipids can move laterally. Cholesterol in animal cell membranes provides some rigidity to the membrane. In plants, the cell wall provides support. Describe how proteins and carbohydrates are spatially arranged in cell membranes and how they contribute to membrane function. Integral proteins contact the hydrophobic core and some (transmembrane proteins) span the entire membrane. Peripheral proteins are loosely bound to the surface of the membrane. Carbohydrates are covalently bound to either lipids or proteins. Protein function in transport, signal transduction, cell recognition, and cell adhesion. Describe factors that affect the selective permeability of membranes. The lipid bilayer is permeable to non-polar molecules, such as CO 2 , O 2 , and hydrocarbons. Polar molecules must pass through some type of protein channel. Describe the locations and functions of transport proteins.
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WS5KEY - Worksheet Chapter 5 KEY pg1 of 3 Describe the...

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