lecture 2 - lipids

Question 1

What are two properties of lipids?

Answer 1

• insoluble in water

- soluble in non - polar solvents such as chloroform, hydrocarbons and benzene

Question 2

what are the 3 functions of lipids?

Answer 2

• energy storage
  membrane structure
• hormones and signalling

Question 3

What is the difference in complex vs simple lipids?

Answer 3

simple lipids Coe from one or two components

Question 4

Which lipid type is more common in nature?

Answer 4

complex lipids

Question 5

Which type of lipid is more complex

Answer 5

simple lipids , have many specific functions

Question 6

What is a typical feature of a fatty acid chain?

Answer 6

• Has a carboxyl group which has a pka of 4.5.

- Therefore can be ionised at most pHs

Question 7

What is the most common double bond structure in fatty acids?

Answer 7

cis bonds

Question 8

What does the cis double bond do?

Answer 8

forms a kink in the chain

Question 9

What does ‘oate’ on the end of name signify?

Answer 9

its in an ionised form

Question 10

What are fatty acids termed

Answer 10

‘oic acid’ or ‘oate’

Question 11

What are triacyl glycerols?

Answer 11

3 fatty acid groups linked to one glycerol molecule

Question 12

What lipid is the main store of energy?

Answer 12

triacyl glycerols

Question 13

What does double bonds in a fatty acid tail do?

Answer 13

Means the lipid is an liquid at room temperature, this is due to the fact the molecules can not get close together

Question 14

What effect does chain length have on melting temperature?

Answer 14

longer chain = more interaction more solid

Question 15

What does amphipathic molecules mean?

Answer 15

Have both a hydrophilic part and hydrophobic part

Question 16

Are Triacylglycerols amphipathic?

Answer 16

no - they are neutral