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- #Class 11
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- #Cell Structure and Function
Which of the following are not polymeric?
Option: 1
Nucleic acids
Option: 2
Proteins
Option: 3
Lipids
Option: 4
Polysaccharides.
Answers (1)
Lipids and Fatty Acids
- Lipids are a diverse group of compounds that are made up of carbon, hydrogen and oxygen.
- They are hydrophobic in nature due to their fatty acid component.
- Fatty acids are hydrocarbon chains to which carboxyl group is attached.
- The number of carbons in the fatty acid may range from 4 to 36.
- Different fatty acids have different length, degree of unsaturation (number of double bonds) and properties such as melting point, fluidity etc.
- The length of the fatty acids determines their melting point. As the length increases, the melting point increases.
- Fatty acids are amphipathic molecules, that is, they have both hydrophilic (carboxylic acid) and hydrophobic (hydrocarbon) component.
- But they are largely non-polar (hydrophobic) due to large hydrocarbon chains.
- If there are only single bonds between neighbouring carbons in the hydrocarbon chain, the fatty acid is said to be saturated.
- Saturated fatty acids are saturated with hydrogen; in other words, the number of hydrogen atoms attached to the carbon skeleton is maximized.
- For example, Stearic acid
Lipids are not polymers. They are made up of glycerol and fatty acid.
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