Phospholipids

Question 1

Unlike triglycerides, there are only …. fatty acids bonded to a …….molecule in a phospholipid as one has been replaced by ……………

Answer 1

2

glycerol

phosphate ion (PO43-)

Question 2

As the phosphate(head) is polar and charged it is ………..

Answer 2

soluble in water (hydrophilic) attracts water interacts with water based environment

due to it being charged repels other fats

Question 3

The fatty acid ‘tails’ are non-polar and therefore

but will mix with ………

Answer 3

The fatty acid ‘tails’ are non-polar and therefore insoluble in water (hydrophobic)

other fats

Question 4

Polar molecules are molecules that have an

Answer 4

unequal distribution of charge

Question 5

non-polar are molecules are molecules that have an

Answer 5

equal distribution of charge

Question 6

Phospholipids are the major components of

Answer 6

cell surface membranes. They have 2 fatty acid tails that are hydrophobic and a phosphate head, that is hydrophilic, attached to a glycerol molecule.

Question 7

Phospholipids are amphipathic

Answer 7

(they have both hydrophobic and hydrophilic parts)

As a result of having hydrophobic and hydrophilic parts phospholipid molecules form monolayers or bilayers in water