15. (2 pts) The following structure represents: Fatty acid unit Sugar unit A) ph

Question

15. (2 pts) The following structure represents: Fatty acid unit Sugar unit A) phosphatidic acid B) phosphatidylcholine C) sphingomyelin D) cerebroside E) phosphatidylinositol 16. (2 pts) Which of the following membranes would be the most fluid? A) a bilayer made of lipids with polyunsaturated 18-carbon fatty acids B) a bilayer made of lipids with saturated 18-carbon fatty acids C) a bilayer made of lipids with saturated 16-carbon fatty acids D) a bilayer made of lipids with polyunsaturated1 E) All of the above are equivalent in fluidity. 17. (2 pts) An antiporter and a symporter are examples of A) passive diffusion. B) primary active transporters. C) entropy-driven pores. D) an ABC transporter. E) a secondary transporter. 18. (2 pts) The mechanism by which insulin-signaling processes might be terminated include: A) change in temperature. B) the aggregation of all protein subunits. C) protein dephosphorylation by phosphatases. D) All of the above. E) None of the above. 19. (2 pts) The energy fortransport comes from the gradient itself. A) active B) facilitated C) passive D) pumped E) ATP-mediated

Explanation / Answer

Question 15: (D) Cerebroside

Question 16: (C) Lipd with saturated 16-Carbon Fatty Acid

Question 17: (E) a secondary transporter

Question 18: (C)    protein dephosphorylation by phosphatases

Question 19: (C) Passive  

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