Topic 3- Voice Of A Genome

Question 1

What are cell membranes composed of?

Answer 1

A phospholipid bilayer.

Question 2

What is the phospholipid made up of?

Answer 2

Hydrophilic phosphate head, and two hydrophobic fatty acid tails

Question 3

EXAM Q, 2 MARKS- describe the structure of a phospholipid bilayer

Answer 3

• hydrophobic tails facing inwards
• hydrophilic heads outside
• bilayer

Question 4

Describe the structure of a phospholipid

Answer 4

Phospholipids are composed of a hydrophilic head made
up of a glycerol joined to a phosphate group held
together by a phospho-ester bond.
The hydrophilic head is polar and can dissolve in water.
And two hydrophobic fatty acid tail joined to the
glycerol molecule by ester bond formed during
condensation reactions.
The hydrophobic tails is not polar so it is insoluble in
water.