3 Na\textsuperscript{+} out of the cell and 2 K\textsuperscript{+} into the cell

Glucose transport into a cell coupled with Na\textsuperscript{+} influx

Question 1

Which of the following best describes the permeability of the cell membrane to ions such as Na	extsuperscript{+} and K	extsuperscript{+}?

Accepted Answer

Selectively permeable, allowing some ions to pass more easily than others

Question 2

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will swell and may undergo hemolysis

Question 3

Which of the following molecules can most easily diffuse across the phospholipid bilayer of the cell membrane?

Accepted Answer

O	extsubscript{2}

Question 4

What is the primary driving force for the movement of K	extsuperscript{+} out of a neuron at rest?

Accepted Answer

Chemical gradient

Question 5

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient via a carrier protein

Question 6

The sodium-potassium exchange pump moves:

Accepted Answer

3 Na	extsuperscript{+} out of the cell and 2 K	extsuperscript{+} into the cell

Question 7

Which of the following is an example of secondary active transport?

Accepted Answer

Glucose transport into a cell coupled with Na	extsuperscript{+} influx

Question 8

Which of the following statements about osmosis is correct?

Accepted Answer

Water moves from areas of low solute concentration to high solute concentration

Question 9

A cell is placed in a hypertonic solution. What will happen to the cell?

Accepted Answer

It will shrink due to water loss

Question 10

Which of the following best describes the resting membrane potential of a typical neuron?

Accepted Answer

$$-70\ \mathrm{mV}$$, with the inside of the cell more negative than the outside

Question 11

Which of the following is true regarding voltage-gated ion channels?

Accepted Answer

They open in response to changes in membrane potential

Question 12

During depolarization of a neuron, which of the following occurs?

Accepted Answer

The membrane potential becomes less negative

Question 13

Which of the following is a property of carrier-mediated transport?

Accepted Answer

It can be saturated if all carriers are occupied

Question 14

Which of the following best explains why ions cannot freely cross the lipid bilayer?

Accepted Answer

Ions are hydrophilic and repelled by the hydrophobic core

Question 15

Which of the following would increase the rate of diffusion across a cell membrane?

Accepted Answer

Increasing the concentration gradient

Question 16

Which of the following is an example of a chemically gated ion channel?

Accepted Answer

A channel that opens in response to acetylcholine binding

Question 17

What is the effect of the sodium-potassium pump on the resting membrane potential?

Accepted Answer

It helps maintain a negative charge inside the cell

Question 18

Which of the following best describes cotransport?

Accepted Answer

Two substances move in the same direction across the membrane

Question 19

Which of the following is true about the electrochemical gradient for Na	extsuperscript{+} in a resting neuron?

Accepted Answer

Both the electrical and chemical gradients drive Na	extsuperscript{+} into the cell

Question 20

Which of the following best describes hyperpolarization?

Accepted Answer

The membrane potential becomes more negative than resting potential

Membrane Transport, Membrane Potential, and Bioelectricity: Study Notes for Human Anatomy & Physiology I

Study Guide - Practice Questions