LEC01

Question 1

What are lipids?

Answer 1

Fatty compounds that control what comes and goes from the cell.

Question 2

Triacylglycerol or Triglycerides (non-polar and neutral)

Answer 2

• A type of fat that stores energy in the fat cells of the body.
• They cannot dissolve in aqueous cytosol as they are neutral.
• Synthesised in the endoplasmic reticulum and accumulate in the hydrophobic core or the ER bilayer.

Question 3

Phospholipids

Answer 3

1. Hydrophilic
   - Water loving, contacts the aqueous environment.
2. Hydrophobic
   - Water hating, middle of the membrane

Question 4

Functions of the Cell Membrane (List Them)

Answer 4

1. Encloses and protects the cell’s contents
2. Links to structures that provide cell structure or movement
3. Transports of solutes in and out of the cell.

Question 5

Passive Transport

Answer 5

• No energy required
• Solute moves through designated protein channel
• High to low

Question 6

Active Transport

Answer 6

• Energy required (ATP)
• For larger molecules
• Goes low to high, therefore against the gradient

Question 7

Diffusion

Answer 7

Hydrophobic molecules and very small un-charged polar molecules can diffuse through the bilayer.

Question 8

Facilitated Diffusion

Answer 8

Molecules pass through with the help of select proteins (channel - left or carrier - right).

Question 9

Endocytosis

Question 10

Exocytosis