Chapter 5.2 The Plasma Membrane

Question 1

What is the plasma membrane?

Answer 1

The flexible boundary of a cell that separates a cell from its surroundings

Question 2

What is another name for the plasma membrane?

Answer 2

Cell membrane

Question 3

What cell organelle regulates what enters and leaves the cell?

Answer 3

Plasma membrane

Question 4

What are the functions of the cell membrane?

Answer 4

1. Regulates what enters and leaves the cell
2. Provides support
3. Provides protection

Question 5

Describe selective permeability.

Answer 5

1. Some molecules are allowd to pass through the plasma membrane at anytime
2. Other molecules are only allowed at certain times or in limited amounts.
3. Some molecules are never allowed to pass through the plasma membrane

Question 6

What is the double layered sheet that makes up nearly all plasma membranes called?

Answer 6

Phospholipid bilayer

Question 7

What is a phospolipid made up of?

Answer 7

It is made up of a glycerol, two fatty acids and a phosphate group.

Question 8

Plasma membranes have what embedded in the phosphlipid bilayer?

Answer 8

Protein molecules

Question 9

What are attached to many of the proteins in the plasma membrane?

Answer 9

Carbohydrates

Question 10

The model of the structures in the plasma membrane is called what?

Answer 10

The fluid mosaic model

Question 11

How is a plasma membrane like a window screen?

Answer 11

Each allows some things to pass while keeping other things out.

Question 12

What is the head of the phospholipid composed of?

Answer 12

Phosphate

Question 13

What is the tail of the phospholipid composed of?

Answer 13

Fatty acid chain

Question 14

What does hydrophilic mean?

Answer 14

Attracted to water

Question 15

What does hydrophobic mean?

Answer 15

Repels water

Question 16

Which part of the phospholipid is hydrophilic?

Answer 16

Head

Question 17

Which part of the phospholipid is hydrophobic?

Answer 17

Tail