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Waxes

Fatty acids, ...

Question

Fatty acids, if esterified with an alcohol of high molecular weight, instead of glycerol, the resulting compound will be _____.

A

Wax

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B

Steroids

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C

Carotenoids

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D

Glycerides

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Solution

The correct option is A Wax
There are two types of simple lipids. They are fats and waxes. The fats are formed from esterification of fatty acids with glycerol, whereas waxes are formed from esterification of fatty acids with high molecular weight alcohol.

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Q. Fatty acids, if esterified with an alcohol of high molecular weight, instead of glycerol, the resulting compound will be _____.

Q. Complete the following passage(s) with an appropriate word/term to be filled in the blank spaces

Glycerol, Methyl, 20 Carbon, Trihydroxy propane, a Carboxyl, Insoluble, Fatty acids, 16 Carbons, Triglycerides, Lower
Lipids are generally water ..........(1)........They could be simple fatty acids. A fatty acid has ..........(2)........ group attached to an R group. The R group could be a ..........(3)........ (--CH

_{3}

), or ethyl (-C

_{2}

_{5}

) or higher number of -CH

_{2}

groups (1 carbon to 19 carbons). For example, palmitic acid has ..........(4)........ including carboxyl carbon. Arachidonic acid has ..........(5)........ atoms including the carboxyl carbon. Fatty acids could be saturated (without double bond) or unsaturated (with one or more C = C double bonds). Another simple lipid is glycerol which is ..........(6):....... Many lipids have both ..........(7)........and ..........(8)........Here the fatty acids are found esterified with glycerol. They can be then monoglycerides, diglycerides and .........(9).......... These are also called fats and oils based on the melting point. Oils have ..........(10)........ melting point (e.g., gingely oil) and hence remain as oil in winters.

STATEMENT-1 : Lecithin is a phospholipid.
STATEMENT-2 : Lecithin is made up of fatty acid, glycerol (or) other alcohol, nitrogenous base and phosphoric acid.

Q. Which ones are not true?
(a) Glycerol is a 3-carbon alcohol with 3-

O H

groups as binding sites
(b) Waxes are esters of long chain alcohol and saturated fatty acids
(c) The term protein was coined by Mulder
(d) Agar is an indispensable polysaccharide being a complex polymer of glucose and sulphur containing carbohydrates

Q. The final products of protein digestion are

(a) amino acids
(b) glucose
(c) fatty acids
(d) glycerol

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