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BIOL 1020 (281)
Joy Stacey (44)
Lecture 9

BIOL 1020 Lecture 9: Lecture 9

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University of Manitoba
Biological Sciences
BIOL 1020
Joy Stacey

Bio lecture 9 Membrane structure and function 1 Increase in unsaturated phospholipids would tend to increase membrane fluidity Membrane fluidity: fatty acid composition Membranes must remain fluid to work properly How do organisms cope with cold or warm temperatures? Ie. How do they maintain needed fluidity of their cell membranes? Unsaturated fatty acids more fluid than saturated fatty acids (kinks in the tail preventing phospholipids from packing together) Cold temperatures: homeoviscous adaptation same viscosity maintain viscosity **Temperature rises: membrane becomes more fluid if becomes too fluid there is a compensation. Compensation is to increase the number of saturated fatty acids **Temperature decreases: membrane becomes too solid Compensation: decrease the saturated fatty acids Increases the unsaturated fatty acids Eg. Homoviscous adaptation in clams in New Brunswick (cannot escape cold temperatures will decrease membrane fluidity) In clams, in October and November there is an increase in unsaturated fatty acids compensation Fatty Acid Composition Eg. Omega 3 capsules position of double bonds To maximize unsaturated f.a. content, whens the best time of year to catch a marine fish? *In the winter * when they are compensating for cold temperatures Membrane fluidity: cholesterol Cholesterol stabilizes membrane fluidity (dual role) Warm temperatures: restrains movement of phospholipids, decreases fluidity
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