10

Question 1

Facilitated diffusion

Answer 1

Transport of molecules across the cell membrane by carriers of integral membrane protein. The direction goes from higher to lower concentration; passive transport. It is utilised by molecules that are unable to freely cross the phospholipid bilayer (e.g. large, polar molecules and ions such as monosaccharides and amino acids).

Question 2

Mechanisms and characteristics:

Answer 2

1. Why facilitated
2. Kinetics similar to kinetics of enzyme reactions
3. pH-optimum
4. Temperature optimum
5. High specificity
6. Inhibition
7. Genetically determined