Unit 1.3(a) - Proteins, Membrane Proteins, Movement of molecules across membrane proteins

Question 1

What is the plasma membrane made from

Answer 1

a bi-layer of phospholipid

Question 2

What characteristics do the Phospholipid head and tails have?

Answer 2

Hydrophilic, charged heads
hydrophobic, non polar tails

Question 3

What are integral proteins

Answer 3

Proteins held within the membrane

Question 4

What are peripheral proteins

Answer 4

Not embedded but bound to the surface of membranes

Question 5

What kinds of molecules can move directly through the bi-layer

Answer 5

Small, non-polar molecules such as CO2 and O2

Question 6

What are channel proteins?

Answer 6

Proteins which allow molecules to pass through the membrane, no comformational change to the protein is required

Question 7

What are the two types of Gated channels

Answer 7

Ligand gated and voltated gated channels

Question 8

How is energy generated for Sodium pump?

Answer 8

ATP is hydrolysed which allows the protein to become phosphorylated

Question 9

What does glucose symport do?

Answer 9

Transports sodium ions down their concentration gradient whilst moving glucose molecules against their concentration gradient