Chapter 9: Biomolecules
This worksheet covers the chemical composition of living organisms, the structure and function of various biomolecules, and the nature of enzyme action. Total: 40 marks.
Section A: Fill in the Blanks [20 Marks]
Complete the following sentences with the correct term.
The relative abundance of carbon and ________ with respect to other elements is higher in any living organism than in the earth's crust.
To analyse its chemical composition, a living tissue is ground in ________ (Cl₃CCOOH) using a mortar and pestle.
After grinding a tissue in acid and straining it, the two fractions obtained are the filtrate (acid-soluble pool) and the retentate (acid-________ fraction).
The 'ash' that remains after a living tissue is fully burnt contains ________ elements like calcium and magnesium.
Amino acids are called ________ because they contain an amino group and an acidic group as substituents on the same α-carbon.
Section B: Multiple Choice Questions [20 Marks]
Choose the single best answer for each question.