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Biology · BIOMOLECULES

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

Correct answer · Option 2

They are arranged in membranes which break into water-insoluble vesicles that do not filter through cheesecloth.

Explanation

Disruption of cell membranes forms water-insoluble vesicles that segregate into the acid-insoluble pellet despite lipids having molecular weights below 800 Da.

Related questions

Based on the average cellular composition of living tissues, arrange the following components in descending order of their percentage of total cellular mass:\nI. Nucleic acids II. Carbohydrates III. Proteins IV. Lipids→Given below are two statements: Statement I: The ash remaining after completely burning a living tissue sample contains inorganic compounds such as sulphate and phosphate in addition to inorganic ions. Statement II: Elemental analysis gives the elemental composition of living tissues, whereas compound analysis gives an idea of organic and inorganic constituents. In the light of the above statements, choose the most appropriate answer from the options given below:→Which of the following carbohydrates is a polymer of fructose?→Consider the following statements about protein structure: (A) In a polypeptide chain, the first amino acid is designated as the C-terminal amino acid. (B) In proteins, only right-handed helices are observed in the secondary structure. (C) Collagen is the most abundant protein in the animal world. (D) RuBisCO is the most abundant protein in the entire biosphere. (E) All proteins are homopolymers composed of repeating units of a single amino acid. Choose the correct answer from the options given below:→
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