3.1 Structure of Plasma Membrane

Question 1

The necessity of movement of substances across a plasma membrane

Answer 1

• Allow some substances to move into and out of the
cells to maintain the living processes.

• Regulates the movement of substances across the
plasma membrane

Question 2

Types of Molecules:

1. Cholesterol
2. Carrier protein
3. Pore protein
4. Glycolipid
5. Glycoprotein

Answer 2

1. Strengthened the plasma membrane
   Makes the plasma membrane to be more flexible but less permeable to water-soluble molecules
2. Transport large molecules such as glucose, amino acids, and vitamin C across the plasma membrane
3. Allow small and water-soluble molecules such as ions to pass across the plasma membrane through passive transport
4. A combination of lipids and polysaccharides helps the cell recognition
5. A combination of proteins and polysaccharides helps the cell-cell recognition

Question 3

Permeability of plasma membrane

Answer 3

The plasma membrane is semi-permeable because it only allows certain molecules or ions to pass through it by simple diffusion