3. Cell Membrane Structure

Question 1

What is the cell respiration formula?

Answer 1

C6H12O6 + 6O2 —> 6CO2 + 6H2O + ATP

Glucose + Oxygen —> Carbon Dioxide + Water + Energy

Question 2

Define Cell Membrane

Answer 2

Cell membrane is what separates the intracellular environment from the extracellular environment.

Question 3

State 4 functions of the cell membrane

Answer 3

1. Physical barrier (separates inside from the outside)
2. Regulation (movement of substances)
3. Sensitivity (change in surroundings)
4. Support (anchors cytoskeleton; other cells)

Question 4

Define Extracellular fluid

Answer 4

Extracellular fluid is the fluid that is outside the cell and broken up into two parts: intersitial fluid and plasma.

Question 5

Define Intracellular Fluid

Answer 5

Intracellular fluid is the fluid that is within the cell.

Question 6

Define Fluid Mosaic Model

Answer 6

The fluid mosaic model observes that the cell membrane is made of several types of molecules (phospholipids, proteins, cholesterol and carbohydrates) and s constantly moving.

Question 7

Explain the life process which a basic cell goes through

Answer 7

Water, oxygen and nutrients enter into, heat energy released, carbon dioxide and water exits out of the cell and between this process it goes through cell respiration which occurs in the mitochondria.

Question 8

Label all the arrows in this image this image

Answer 8

Question 9

State 4 molecules which make up the cell membrane

Answer 9

• Phospholipid (majority)
• Proteins (spread out)
• Carbohydrate and Cholestrol (may be present)

Question 10

State what makes the cell membrane

Answer 10

• Phospolipid bilayer

- Made packed phospholips to form a bilayer with phosphate heads outside and lipid tails facing inwards

Question 11

State what a phospholipid is made of

Answer 11

• Special lipids made of gylcerol
• Phosphate head which is hydrophilic (water-loving)
• Lipid tails which are hydrophobic (water-hating)

Question 12

What makes a phosphate head hydroplilic?

Answer 12

Phosphate head is hydrophilic as it is soluble and has a charge.

Question 13

What makes a lipid tail hydrophilic?

Answer 13

Lipid tails are hydrophobic because they are insoluble and have no charge.

Question 14

Provide 9 examples of plasma proteins

Answer 14

• channels, cell surface, enzyme, channel forming, pores, surface makers, transporters, receptorsband transmembrane

Question 15

State why is there cholestrol in the membrane

Answer 15

Cholestol is found between pholipids and provide stability to the membrane.