Movement Acroos Membranes

Question 1

Describe active transport

Answer 1

Cells move molecules against concentration gradient
(Low - high)

Uses a protein pump, requires ATP

Question 2

Describe passive transport

Answer 2

Simple diffusion - diffusion of non polar, hydrophobic molecules

Facilitated diffusion - diffusion of polar, hydrophilic molecules through a protein channel

Question 3

Difference between anti port and symport

Answer 3

Antiport - draw molecules in against concentration gradient

Symport - sodium generates enough energy that amino acid is pulled along with it… Draws molecules with concentration gradient of another molecule

Question 4

What molecules can get through a phospholipid bilayer directly?

Answer 4

Fats and other lipids

Polar molecules (water), ions (salts, ammonia), and large molecules (starch, proteins) cannot get though directly