Worksheet Chapter 4: Chemical Composition in Cells

1. State two biological importances of water in living cells.

2. Name the three sub-component parts that make up a single nucleotide unit in nucleic acids.

3. True or False: Saturated fats contain one or more double bonds (C=C) in their hydrocarbon chains.

4. Compare and contrast Deoxyribonucleic Acid (DNA) and Ribonucleic Acid (RNA).

5. True or False: Sucrose produces a brick-red precipitate when heated directly with Benedict's reagent without prior acid hydrolysis.

6. A sample of food solution was tested in a laboratory:
- Test A: Adding Iodine solution yielded a yellow-brown color.
- Test B: Heating with Benedict's reagent yielded a brick-red precipitate.
- Test C: Adding Biuret reagent yielded a purple solution.
Interpret the biochemical contents present in the food sample.

7. Fill in the blank: The bond formed between two amino acids during a condensation reaction is called a ________ bond.

8. Explain the structural difference between saturated fats and unsaturated fats, and state how this affects their physical state at room temperature.

9. Which of the following biomolecules consists of glycerol combined with three fatty acid chains?

10. Enzymes are functional proteins with a specific 3D shape.
(a) Explain what happens to the tertiary structure of a protein when exposed to temperatures exceeding 60°C.
(b) Describe how this structural alteration affects enzyme function.