quiz1-06 - ` BISC 306, General Physiology Quiz 1, September...

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` NAME ______________________ BISC 306, General Physiology Quiz 1, September 20, 2006 1. Phospholipid molecules in cell membranes. .. a. are the only type of lipid molecule in membranes b. have both hydrophilic and hydrophobic portions c. may serve as substrates in cell signaling mechanisms d. a and b e. b and c 2. Which of the following is not true regarding Na + movement across cell membranes? a. can be active or passive b. typical cellular gradients favor outward diffusion c. is affected by the membrane voltage or PD d. passive movement may be linked to the active transport of another solute e. produces an electrical current across the membrane 3. Two isoforms of the same transporter mediate the active uptake of glutamine into cells (hypothetical). The Km for isoform A is 100 micromolar and the Km for isoform B is 2 millimolar. Which isoform has the higher affinity? a. isoform A b. isoform B 4. In the outward-facing conformation, the Na + /K + -ATPase would have a relatively high affinity for:
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quiz1-06 - ` BISC 306, General Physiology Quiz 1, September...

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