Q4. Assertion: lipids are found in the acid-insoluble fraction. Reason: lipids are polymers of molecular weight above ten thousand daltons. Are both true, and does the reason explain the assertion?
The assertion is true and the reason is false: typical membrane lipids are not long repeating-unit polymers and reach that fraction as membrane vesicles (NCERT pages 108–109).
Q5. What percentage of a cell’s mass is nucleic acid, on average?
5–7 per cent (NCERT Table 9.4, page 109).
Q6. Arrange carbohydrates, lipids, ions and nucleic acids in decreasing share of cell mass.
Nucleic acids (5–7) > carbohydrates (3) > lipids (2) > ions (1) (NCERT Table 9.4, page 109).