Biology · BIOMOLECULES

During chemical analysis of living tissue, which of the following features explains why lipids are recovered in the macromolecular (acid-insoluble) fraction despite having molecular weights not exceeding 800 Da?

1. A
   They form covalent polymers with cytoplasmic proteins during extraction.
2. B
   They are arranged in membranes which break into water-insoluble vesicles that do not filter through cheesecloth.
3. C
   Their individual molecular weights exceed 10,000 daltons due to extensive branching.
4. D
   They are converted into insoluble carbohydrate complexes by trichloroacetic acid.