What is the primary function of the cell membrane?

To control the movement of substances into and out of the cell.

To generate ATP for cellular processes.

To provide rigid structural support to the cell.

How are phospholipids arranged in the cell membrane's bilayer structure?

The hydrophobic tails face each other in the interior of the membrane.

The hydrophilic heads face inward, away from water.

The hydrophobic tails face the watery environments outside and inside the cell.

They are randomly scattered without a specific orientation.

What is the main function of cholesterol within the cell membrane?

To stabilize the membrane and help regulate what passes through it.

To act as a channel for large, charged molecules.

To provide cell identification markers.

What are the main components of a phospholipid molecule?

Fatty acids, glycerol, phosphate group

Amino acids, glucose, phosphate group

Fatty acids, cholesterol, phosphate group

Glycerol, glucose, nitrogen group

What is the outcome when two solutions of different tonicities are separated by a selectively permeable membrane?

Solvent moves from the hypotonic to the hypertonic solution.

Solvent moves from the isotonic to the hypertonic solution.

Solvent moves from the hypertonic to the hypotonic solution.

What is a key characteristic of facilitated diffusion?

It utilizes transport proteins to move molecules.

It moves molecules against their concentration gradient.

It is used for very small, non-polar molecules.

This diagram shows a red blood cell in a beaker that contains a solution with higher salt concentration than that inside the red blood cell. What will happen to the red blood cell in this environment?

The red blood cell will shrink from losing water molecules.

The size of the red blood cell will remain constant.

The red blood cell will swell at first and then shrink.

The red blood cell will swell from absorbing salt molecules.

Cell Membrane and Transport Notes

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NGSS.MS-LS1-2, 112.34.c.4.B, NGSS.MS-LS1-1

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Heather Dammeyer

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