Facilitated diffusion

Question 1

characteristics

Answer 1

• movement down a concentration gradient
• no energy required / passive transport
• assistance required (presence of transmembrane protein)

Question 2

examples

Answer 2

charged particles (ions), glucose, amino acid

Question 3

3 types of transmembrane proteins involved

Answer 3

1. Ion channel
2. water channel (aquaporins)
3. Transporters channel (carriers)

Question 4

ion channel

Answer 4

pore-like structure that lets ions pass through, but doesn’t physically bind them (Na+, K+, Cl- ions)

Question 5

water channel (aquaporins)

Answer 5

transmembrane proteins that specifically let water molecules pass through the membrane quickly (faster then osmosis)

Question 6

transporters (carriers)

Answer 6

transmembrane proteins bind a molecule (glucose, amino acid) on one side of a membrane and then undergo conformational changes that carry and deliver bound molecules to the other side of the membrane (uniporters)