The acid soluble pool represents roughly the cytoplasmic composition. The macromolecules from cytoplasm and organelles become the acid insoluble fraction. Together they represent the entire chemical composition of living tissues or organisms.
Adjacent to a frequently-asked paragraph in the same chapter.
Why are lipids found in the acid-insoluble fraction despite having low molecular weight?
Correct answer: A — Because they are insoluble in water
On grinding tissues, membrane-bound lipids form water-insoluble vesicles and thus separate in the acid-insoluble pool.
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