Introdution

Question 1

Are phosphate heads hydrophilic or hydrophobic?

Answer 1

Hydrophilic. They are molecules that mix with H2O, usually molecules containing oxygen (ex. carbohydrates)

Question 2

Are fatty acid tails hydrophilic or hydrophobic?

Answer 2

Hydrophobic. They do not mix with H2O and are usually long carbon chains (ex. lipids)

Question 3

What are the three membrane proteins called?

Answer 3

1. Transmembrane protein (the one in the whole phospholipid bilayer
2. Extrinsic protein (outside part of membrane
3. Intrinsic protein (Inside part of membrane

Question 4

What is osmosis?

Answer 4

The movement of water molecules through a partially permeable membrane, down a concentration gradient.

Question 5

How do bigger water-soluble molecules cross the membrane?

Answer 5

The channel protein allows larger molecules to cross the membrane with hydrophobic fatty acid tails.

Question 6

Define uniport

Answer 6

A uniport is the transport of only one molecule, without coupling to the transport of another molecule or ion

Question 7

Define symport

Answer 7

Symport is the type of transport in which two compounds can move simultaneously across a cell membrane in the same direction.

Question 8

Define antiport

Answer 8

Antiport is a process in which two different species of solutes or ions are pushed across a membrane in opposite directions.