Chapter 12, Problem 9Q

A.

Summary Introduction

To explain: Whether the statement “The plasma membrane is highly impermeable to all charged molecules” is correct or incorrect.

B.

Summary Introduction

To explain: Whether the statement “Channels have specific binding pockets for the solute molecules they allow passing” is correct or incorrect.

C.

Summary Introduction

To explain: Whether the statement “Transporters allow solutes to cross a membrane at much faster rates than do channels” is correct or incorrect.

D.

Summary Introduction

To explain: Whether the statement “Certain H⁺pumps are fueled by light energy” is correct or incorrect.

E.

Summary Introduction

To explain: Whether the statement “The plasma membrane of many cells contains open K⁺ channels, yet the K⁺ concentration in the cytosol is much higher than outside the cell.”is correct or incorrect.

F.

Summary Introduction

To explain: Whether the statement “A symport would function as an antiport if its orientation in the membrane were reversed” is correct or incorrect.

G.

Summary Introduction

To explain: Whether the statement “The membrane potential of an axon temporarily becomes more negative when an action potential excites it”is correct or incorrect.