Cell Transport

Question 1

What are the two types of cellular transportation?

Answer 1

1. Passive
   - NO additional energy required
2. Active
   - additional energy required

Question 2

what are the three examples of passive transport?

Answer 2

• simple diffusion
• osmosis
• facilitated diffusion

Question 3

Simple Diffusion

Answer 3

• molecules NATURALLY moving from high concentration to low
• caused by the COLLISION OF PARTICLES
• PASSIVE

Question 4

what are the four things diffusion rate is influenced by? (think: STCM)

Answer 4

1. SIZE - small molecules diffuse faster
2. TEMPERATURE - hotter temps add extra energy, speeding up the process
3. CONCENTRATION - higher concentration = more collisions = faster diffusion
4. MEDIUM - solids restrict diffusion more than fluids

Question 5

Osmosis

Answer 5

• diffusion of WATER across a semipermeable membrane
• relies only on the CONCENTRATION GRADIENT
• hyper/hypo/iso-tonic
• PASSIVE

Question 6

Facilitated Diffusion

Answer 6

• diffusion via the help of specific
  transmembrane integral proteins (protein channels)
• PASSIVE

Question 7

Active Transport

Answer 7

• the movement of molecules AGAINST the concentration

- requires : transport proteins and energy (ATP - adenosine triphosphate)