BICD110_PS1_wANSWERS

BICD110_PS1_wANSWERS - Answers Problem Set#1 BICD110 SSII...

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Answers Problem Set #1 BICD110 SSII 2009 1. Answer. Secondary Active Transport. Sugar and amino acid uptake mediated by symport proteins in the apical membrane of intestinal epithelial cells. They use co- transport of Na+ down its electrochemical gradient to drive sugar and amino acid movement into cell (up their concentration gradients). If Na+/K+ ATPase is not working, there is a reduced Na+ gradient and therefore a reduced driving force for these other pumps. 2. Answer. Antarctic fish, which are cold-blooded, live in freezing waters. In order to maintain an appropriate fluidity of their membranes under such extreme conditions, they require a higher proportion of unsaturated fatty acid chains in their membranes. Polar bears also live in extreme cold, but they are warm-blooded and maintain a high internal temperature; thus, they have no special requirement for unsaturated fatty acids in their membranes. 3. Answer. It is not a paradox. The fluidity of the bilayer is strictly confined to one plane: the lipid molecules can diffuse laterally but do not readily flip from one
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BICD110_PS1_wANSWERS - Answers Problem Set#1 BICD110 SSII...

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