Cell Membrane stuff

Question 1

Does diffusion use energy?

Answer 1

No

Question 2

Does facilitated diffusion require energy?

Answer 2

no

Question 3

How does diffusion work?

Answer 3

It occurs because particles move randomly in all directions. Since they are small, these particles will fit through the gaps of the membrane. Sometimes, there are more particles on one side of the membrane than the other. In this case, the concentration of particles is higher on that side. When the concentration is higher on one side, more particles will randomly move towards the lower concentration side.

Question 4

How does facilitated diffusion work?

Answer 4

. It is called facilitated diffusion because the protein helps, or facilitates, particles to pass through the membrane.

Question 5

What does a protein channel do?

Answer 5

these substances travel through the protein channels often from the side of the membrane with a higher concentration to the side with a lower concentration of particle

Question 6

Does active transport require energy?

Answer 6

Yes

Question 7

Does exocytosis require energy?

Answer 7

Yes

Question 8

Does endocytosis require energy?

Answer 8

Yes

Question 9

What does active transport do?

Answer 9

particles are moved from an area of lower concentration to one of higher concentration.

Question 10

What does exocytosis do?

Answer 10

In this process a large particle or many particles are carried to the cell membrane wrapped in a sphere of membrane. The sphere fuses with the cell membrane in order to open up and releases the particles out of the cell.

Question 11

What does endocytosis do?

Answer 11

In endocytosis, part of the cell membrane folds inward to make a pouch. The large particle outside the cell is then surrounded by the membrane pouch, which pinches off to carry the particle into the cell.