AP Bio 2.9

Question 1

What is diffusion?

Answer 1

It’s the movement of molecules from an area of high concentration to an area of low concentration

Question 2

What molecules move freely across a cell memberane?

We probably already took this

Answer 2

Small, nonpolar molecules (such as O2, N2, anf CO2)

Question 3

What are molecules that may move in small amounts through the cell membrane?

Answer 3

Small, polar molecules such as water

Question 4

What is facilitated diffusion, and what passes through it’s protiens?

Answer 4

It’s the movement of molecules from a high to low concentration through transport protiens. Large and small polar molecules move this way. However, charged ions such as Na+ and K+ require channel protiens.

Question 5

What do large quanities of water move through?

Answer 5

Aquaporins

Question 6

What is active transport?

Answer 6

It’s a transport mechanism that moves molecules/and or ions across their concentration gradient by the use of metabollic energy (such as ATP)

Question 7

What are protien pumps?

Answer 7

They are carrier protiens used in active transport