grade 37 Pre-Lab Questions 1. Lipids are defined by property rather than structu

Question

grade 37 Pre-Lab Questions 1. Lipids are defined by property rather than structure. What is the "defining property"? EXPERIMENT 37 2. What are the three groups of lipids and how do they differ? 3. Below are structures of several steroid hormones derived from cholesterol. Circle the steroid nucleus in each. CH3 ??? ?? H3C 0 ?? Progesterone Testosterone 4. Would any of the above give a positive Lieberman-Burchard test? Explain your answer. 5. Cholesterol is an alcohol. Alcohols dehydrate by losing the elements of HOH and forming a carbon-to-carbon double bond. Draw the structure Would this dehydration compound give a positive Lieberman-Burchard test? cholesterol forms upon dehydration.

Explanation / Answer

1.Lipid is a bio molecule that is soluble in non polar solvents (e.g chloroform,diethyl ether ,pentane ,hexane and benzene etc.   

Lipids are not generally dissolved in water including fatty acids and waxes

2.The major three types of lipids are.

a.Fats/oils-Longterm energy storage

b.Phospholipids-Comprise cell membrane

c.Steroids-it is acting as signalling between cells

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