Section 5.3 & 5.4 (MG&DX)

Question 1

What is Passive Transport

Answer 1

Diffusion of a substance across a membrane with no energy investment

Question 2

What is a Concentration Gradient

Answer 2

The difference in the concentration of a substance between two areas

Question 3

What is Osmosis

Answer 3

The movement of water molecules through a selectively permeable membrane from a lower to a higher solute concentration

Question 4

Define Tonicity

Answer 4

The ability of a surrounding solution to cause a cell to gain or lose water

Question 5

What is the difference between isotonic, hypertonic, and hypotonic?

Answer 5

A solution is isotonic when it has an equal concentration both inside and outside of the cell.
A solution is hypertonic when it is more concentrated inside the cell, causing it to burst.
A solution is hypotonic when it is the opposite of hypertonic, with a higher concentration of the solute being outside of the cell.

Question 6

What is Facilitated Diffusion

Answer 6

When Passive Transport is aided by a Protein

Question 7

What are Ion Channels

Answer 7

They are Proteins that help Ions to move across the Cell Membrane.

Question 8

What is the difference between Open and Gated Ion Channels

Answer 8

Open Ion Channels act like pores to allow Ions to simply flow through the membrane
Gated Ion Channels open and close in response to a stimulus, which can electrical, chemical or mechanical.

Question 9

What is Active Transport?

Answer 9

Active Transport uses Energy to move Solutes against their Gradients