*Unit 3 Part 4: The Cell Membrane

Question 1

All cells are surrounded by a _____.

Answer 1

cell membrane

Question 2

What are other terms for the cell membrane?

Answer 2

~Plasma membrane
~Phospholipid bilayer

Question 3

The cell membrane maintains _____, or stable internal conditions.

Answer 3

homeostasis

Question 4

The _____ controls movement in and out of the cell selectively.

Answer 4

cell membrane

Question 5

The cell membrane is _____. This means that the membrane only allows some materials through, not all.

Answer 5

permeable

Question 6

The cell membrane is responsible for _____ and _____ between cells.

Answer 6

communication; recognition

Question 7

What does the fluid mosaic model state?

Answer 7

That the cell membrane is made of different components that move around.

Question 8

What are the four main parts of the cell membrane?

Answer 8

~Double layer of phospholipids
~Cholesterol
~Transport proteins
~Carbohydrates

Question 9

Phospholipids
(functions in the cell membrane)

Answer 9

~Lipids that have charged phosphate heads
~Main componet of membranes

Question 10

Cholesterol
(functions in the cell membrane)

Answer 10

~stabilizes the cell

Question 11

Transport proteins
(functions in the cell membrane)

Answer 11

~Allow specific molecules through

Question 12

Carbohydrates
(functions in the cell membrane)

Answer 12

~Important for cell recognition

Question 13

Polar heads

Answer 13

~Hydrophilic
~Always face either outside or inside of the cell

Question 13

Fatty Acid Tails

Answer 13

~Hydrophobic
~Always face inside the membrane

Question 13

Hydrophilic

Answer 13

like water

Question 14

Hydrophobic

Answer 14

doesn’t like water

Question 15

Inside and outside environment of cells are mostly _____.

Answer 15

water

Question 16

Hydrophobic tails are repelled by water and orient themselves in a _____ layer.

Answer 16

double