Parts Of A Cell Membrane

1. What part of the cell membrane is hydrophobic?

D

E

The phospholipid "tails" are hydrophobic - they are "hiding" (phobic = afraid) away from the watery environment of the cell.

Explanation

The phospholipid "tails" are hydrophobic - they are "hiding" (phobic = afraid) away from the watery environment of the cell.

2. A specific molecule is able to be transported by facilitated diffusion, which part of the cell membrane would a molecule pass through?

A

B

C

D

Facilitated diffusion: No energy needed, but can not fit through the phospholipid bilayer. It needs to go through the protein channels. A is a protein channel. IMPORTANT: DIFFERENT SUBSTANCES NEED TO GO THROUGH DIFFERENT CHANNELS

Explanation

Facilitated diffusion: No energy needed, but can not fit through the phospholipid bilayer. It needs to go through the protein channels. A is a protein channel. IMPORTANT: DIFFERENT SUBSTANCES NEED TO GO THROUGH DIFFERENT CHANNELS

3. What is the purpose of C?

It is an area for facilitated diffusion

It is an area for osmosis

It has no known function.

Carbohydrate "marker" : Identifies cells

Explanation

Carbohydrate "marker" : Identifies cells

4. Which area of the cell membrane is for pumping ions (for example, Sodium and Potassium ions) against the concentration gradient?

A

B

D

E

A pump is used to move substances (example: ions) against the concentration gradient (low to high). It can be distinguished in this picture by the presence of ATP. ATP is the molecule used by the cell for energy.

Explanation

A pump is used to move substances (example: ions) against the concentration gradient (low to high). It can be distinguished in this picture by the presence of ATP. ATP is the molecule used by the cell for energy.