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Q.

Choose the incorrect statement.

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a

Lipids are strictly macromolecules. 

b

Upon grinding a tissue in trichloroacetic acid, the broken membranes of cells form vesicle like structures.

c

Insoluble fraction of cytoplasm has macromolecules and cell organelles.

d

Some secondary metabolites are polymers.

answer is C.

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Detailed Solution

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 Lipids are bio-micromolecules by definition as their molecular weight falls in the range of 18-800 daltons. But during acid hydrolysis of a living tissue they are separated as part of retenate (acid insoluble pool) because the broken fragments of cell membrane form vesicles which are heavier. Thus lipids  got separated as part of  macromolecule fraction.

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