Lipid Metabolism

Question 1

lipids are precursors of signalling molecules, what are the 3 classes of signalling molecules

Answer 1

Prostagladine, leukotriene and thromboxane

Question 2

what is derived from arachidonic acid

Answer 2

the 3 classes of signalling molecules

Question 3

what do triglycerides do

Answer 3

are a form of energy storage (fat)

Question 4

what is the main function of phospholipids

Answer 4

major component of cell membranes

Question 5

what are the functions of cholesterol

Answer 5

• component of cell membrane
• precursor for bile acids and steroid
  hormones
• involved in fat transport

Question 6

what type of acid are lipids

Answer 6

carbonic acids

Question 7

what does it mean if a fatty acid is saturated

Answer 7

there are no double bonds in the chain

Question 8

3 chains of fatty acids binds with a glycerol molecule to form what

Answer 8

triglycerides / triacylglycerols

Question 9

what type of link is between glycerol and a fatty acids

Answer 9

ester link

Question 10

how long TG last in the body

Answer 10

approx. 12 weeks

Question 11

what molecule is the main type of fuel for the brain

Answer 11

glucose

Question 12

why does the brain use glucose instead of triglycerides for energy

Answer 12

TG is too big for the blood brain barrier in the brain

Question 13

what are ketone bodies made out of

Answer 13

2 acetylCoA link together, from the breakdown of fatty acids

Question 14

where are fatty acids oxidised

Answer 14

in the mitochondria

Question 15

how do fatty acids get activated

Answer 15

by linking them to Coenzyme A

Question 16

what kind of reaction is it when fatty acids and Coenzyme A link together

Answer 16

hydrolysis

Question 17

linking coenzyme A and fatty acids together, where does this take place

Answer 17

cytosol

Question 18

how do fatty acids get transferred to the mitochondria

Answer 18

carinite

Question 19

in fatty acid synthesis, what electron donor is used

Answer 19

NADPH + H+