Which one of the following statements about fats is incorrect?

The melting point of fats depends upon the chain length of the constituent fatty acid

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They are sparingly or not at all soluble in water but dissolve in an organic solvent

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They float on water as their specific gravity is less than 1

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They can be absorbed without emulsification

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Solution

The correct option is D They can be absorbed without emulsification
Emulsification is a process where large fat molecules are broken down into smaller ones for absorption. It is an important step (owing to their large sizes) taking place in the duodenum by the action of bile and then by the pancreatic enzyme lipase. They can be emulsified by shaking with water or with emulsifying agents in a laboratory.

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Q. We eat food, which is composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose, amino acids, fatty acids, glycerol etc. What mechanisms are involved in absorption of digested food and water?

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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}

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We eat food composed of all the nutrients like carbohydrates, proteins, fats, vitamins, minerals and water. After digestion, these are absorbed in the form of glucose,amino acids , fatty acids, glycerol etc.

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Fats

Standard XII Biology

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