BIOL 1020 Lecture 9: Lecture 9

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 1020
• Professor: Joy Stacey

Document Summary

Increase in unsaturated phospholipids would tend to increase membrane fluidity. Membrane fluidity: fatty acid composition membranes must remain fluid to work properly. 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. 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. *in the winter * - when they are compensating for cold temperatures. Warm temperatures: restrains movement of phospholipids, decreases fluidity l. Cool temperatures: maintains fluidity by preventing tight packing (because of large structure) Shape of receptor fits chemical messenger specific receptor for specific.