Membrane Function 7.1 - 7.5

Question 1

What composes a Membrane

Answer 1

Phospholid Bilayer

Question 2

What else does the Phospholid Bilayer contain?

Answer 2

Other lipids
Proteins
Carbohydrate

Question 3

What are the General Poperties of a phospholid bilayer?

Answer 3

1. Self assembling in water
2. Individual molecules are not static (Fluid Mosaic)
3. Semi - permeable

Question 4

What are phospholipids permeable to?

Answer 4

Hydrophobic molecules, and water

Question 5

What are phospholipids impermeable to?

Answer 5

Large molecules, ions

Question 6

What are held in the membrane due to:
1. Their hydrophobic and hydrophilic nature
2. Attatchment to cytoskeleton

Answer 6

Membrane proteins

Question 7

Functions of a Membrane protein (5)

Answer 7

1. Enzymes
2. Carry signals
3. Transport
4. Cell recognition
5. Attach membrane to cytoskeleton

Question 8

Diffusion across a membrane - only occurs from an area of high to an area of low concentration.
Does not require energy from cell

Answer 8

Passive transport

Question 9

Rate of Transport depends on what? (3)

Answer 9

1. Temperature
2. Concentration gradient
3. The ability to pass through the membrane

Question 10

What type of diffusion allows materials not permeable to phospholipids pass through protiens?

Answer 10

Facilitated diffusion

Question 11

What prevents the passage of water through most biological membranes?

Answer 11

Cholesterol

Question 12

What process allows for the diffusion of water?

Answer 12

Osmosis

Question 13

Same salt concentration

Answer 13

Isotonic

Question 14

Solution with a lower salt concentration

Answer 14

Hypotonic

Question 15

Solution with a higher salt concentration

Answer 15

Hypertonic

Question 16

A hypotonic cell is ….

Answer 16

Swollen

Question 17

A hypertonic cell is …

Answer 17

Shrunken

Question 18

What transport requires potential energy stored by the cell

Answer 18

Active Transport

Question 19

4 Forms of energy important to living

Answer 19

1. Heat
2. Kinetic energy
3. Potential energy
4. Light

Question 20

Where is potential energy stored in the cell

Answer 20

Bonds in molecules
Concentration gradients

Question 21

Energy released from chemical reactions used to… (3)

Answer 21

1.Change the shape of proteins
2. Move molecules
3. Create new bonds

Question 22

What acts as a short term energy storage and transport unit?

Answer 22

ATP