are the most abundant molecules in the plasma membrane. A. Glycolipids B. Phospholipids C. Prostaglandins D. Proteins E. Cholesterol molecules 7. These membrane proteins bind to signals by which cells communicate. A. receptors B. enzymes C. carriers D. cell-identity markers E. cell-adhesion molecules 8. A receptor protein in the plasma membrane will not bind to just any chemical in the extracellular fluid, but only to certain ones. That is to say, the receptor exhibits A. selectivity B. specificity C. saturation D. fidelity 9. Transmembrane proteins that make up enzymes in the plasma membrane are made up of hydrophilic and hydrophobic regions. Most amino acids embedded in the membrane are while most amino acids facing the extrace ular fluid are A. hydrophilic; hydrophilic B. hydrophilic; hydrophobic C. hydrophobic, hydrophobic D. hydrophobic; hydrophilic E. lipophilic; lipophobic 10. provide motility to a cell, act as sensory “antenna” in many cells, and increase cell’s surface area. A. Cilia, microvilli; flagella B. Microvilli; cilin; flagella C. Microvilli; flagella: cilia D. Flagella; microvilli; cilia E. Flagella; cilin; microvilli 11. Cells lining the small intestine are specialized for absorption of nutrients. Their plasma membrane has A flagella. B. cilin C. microvilli D. glycocalyx E dynein arms

How depolarization or hyperpolarization from the resting potential of –70 mV would affect the ability to reach threshold and fire an action potential.

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