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Simple Lipids

The bond form...

Question

The bond formed between glycerol and fatty acid in a simple lipid is

A

glycosidic bond

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B

hydrogen bond

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C

peptide bond

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D

ester bond

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Solution

The correct option is D ester bond
A simple lipid is an ester of fatty acid with an alcohol, which in most cases is glycerol. An ester bond is formed when two groups are linked together by an oxygen atom.

A glycosidic bond is formed between two sugar units in a disaccharide, oligosaccharide or a polysaccharide chain.

A peptide bond is formed between two amino acids in a polypeptide chain.

A hydrogen bond is formed between the nitrogenous bases in a double-helical nucleic acid chain.

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Q. The bond formed between glycerol and fatty acid in a simple lipid is

Q. A diglyceride on hydrolysis, gave glycerol and a fatty acid. If the formula of fatty acid is

C_{15} H_{31} C O O H

, the diglyceride is:

A) Simple lipid
B) 1,2-stearin
C) 1,2-palmitin
D) 1,3-palmitin

Q. Match Lis I with List II

	List I		List II
(a)	Protein	(i)	C=C double bonds
(b)	Unsaturated fatty acid	(ii)	Phosphodiester bonds
(c)	Nucleic acid	(iii)	Glycosidic bonds
(d)	Polysaccharide	(iv)	Peptide bonds

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.

Q. Statement 1: Lipids are made up of fatty acids and glycerols.
Statement 2: Butter milk is a rich source of lipids.

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