bio quiz 2 purdue
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Name the components and dominant biochemical property of biological membranes.
- Phospholipids, proteins, (glycoprotein, glycolipids)
- Allows for the movement of substances in and out of the cell, semipermeable
Summarize the fluid mosaic model of membrane structure.
- Fluid: lipids, proteins not anchored; can move about from side to side (rarely flip sides)
- Mosaic: made of different parts: lipids, proteins, and carbohydrates
Differentiate between channel proteins and carrier proteins.
- · Channel proteins are integral membrane proteins that form channels across the membrane through which certain substances can pass.·
- Some substances can bind to membrane proteins called carrier proteins that speed up their diffusion through the phospholipid bilayer.
· Summarize similarities and differences among diverse membrane lipids
Phospholipids can differ in terms of fatty acid chain length (number of carbon atoms), degree of unsaturation (number of double bonds) in the fatty acids, and the kinds of polar (phosphate-containing) groups present.
· Predict the structure of a membrane, given data from the membrane structure experiment.
if the surfave area of the phospholipids is 2 to 1 of the surface area of the cells than it is a bilayer 1:1 monolayer 4:1 double bilayer
· Predict the changes a cell might make to membrane fluidity in response to a temperature change./ Describe the factors involved in membrane fluidity.
- Temperature decreases: temperature decreases: cause membranes to become more solid
- Temperature increases: cause membranes to become more fluid
- Unsaturated fatty acids: increase fluidity
- Shorter fatty acid chains: increase fluidity
- Saturated fatty acids: decrease fluidity
- Longer fatty acid chains: decrease fluidity
titlediffusionFacilitated diffusionActive transport Moving forceWith Concentration gradiantWith Concentration gradiantAtp or energy source Membrane proteinsnoYes carrier (binding site) and channel (tube)Yes, carrier moleculesSmall, lipid solubuleSmall to medium , water soluble (polar of charged)Water soluble (polar or charged) directionBoth in and out high to low cgBoth in or outHigh to low cgIn or outAgainst the concentration gradiant low to high
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