Question 1

Describe the process whereby water moves passively across a membrane.

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Question 2

Describe the process whereby the Na+/K+ pump is involved in moving those ions across a membrane.

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Question 3

Since it is the electrochemical gradient that determines the direction and magnitude of an ion's movement across a membrane, describe how one can determine the direction of ion movement based on the electrical and chemical gradients.

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Question 4

Describe the process of facilitated diffusion and the proteins involved in that process.

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Question 5

Describe the factors that affect the rate of passive transport of molecules across a membrane.

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Question 6

Discuss the differences between the osmolarity and tonicity of a solution.

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Question 7

Ions can always move through the ion channels present in the plasma membrane as long as there is an electrochemical gradient to drive the movement.

Accepted Answer

Ion channels can be selective and gated, meaning they can open or close in response to various stimuli, and not all ions can pass through a given channel even if an electrochemical gradient exists.

Question 8

Since diffusion is defined as the random movement of molecules, how can this random movement result in the net movement of ions across a membrane?

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Question 9

Describe the chemical and electrical driving forces that move ions across a membrane.

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Question 10

Describe the processes of primary and secondary active transport, including the factors that can affect active transport.

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Quiz 4: Cell Membrane Transport