E15 - PROPERTIES OF LIPIDS

Question 1

Biomolecules that are generally insoluble in polar solvents like water but soluble in nonpolar solvents like ETHER, CHLOROFORM, and HEXANE

Answer 1

Lipids

Question 2

What are the lipids that are found in the biological membranes?

Answer 2

Polar and Amphipathic lipids

Question 3

Membrane lipids include:

Answer 3

phosphoglycerides
sphingolipids
and cholesterol

Question 4

The major storage form of energy

Answer 4

triglycerides or fats in adipose tissues

Question 5

Most abundant among the lipids and components of almost all lipid molecules like waxes, cholesterol esters, sphingolipids, and triglycerides among others

Answer 5

Fatty acids

Question 6

Amphipathic lipids that could be saturated or unsaturated

Answer 6

Fatty acids
Saturated - abundant in fats
Unsaturated - predominant in plant oils

Question 7

Apparatus needed:

Answer 7

Test tubes
beaker
graduated cylinder
1mL pipets
droppers
filter papers

Question 8

Reagents/Materials needed:

Answer 8

Hexane
cooking oil
palm oil
corn oil
olive oil
bile solution
lecithin solution
detergent solution
albumin solution
bromine in methylene chloride/ in chloroform
1 M NaOH (Sodium Hydroxide)
10% NaOH
3 M acetic acid
ethyl alcohol
chicken bile

Question 9

Qualitative Tests on Lipids:

Answer 9

> Test for solubility
> Translucent spot test
> Sudan IV test
> Test for Unsaturation
> Emulsification of Fats
> Surface tension

Question 10

In the translucent spot test, how many folds are needed in the filter paper?

Answer 10

four (4)