Starch, cellulose and plant fibres Quiz
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5 questions, one answer each
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1. Which bond joins the glucose units within one cellulose chain?
- A. Hydrogen bond
- B. 1,4 glycosidic bond
- C. 1,6 glycosidic bond
- D. Peptide bond
2. Which feature of amylopectin allows rapid release of glucose?
- A. It is helical
- B. It contains β-glucose
- C. It has many branch ends for enzymes to act on
- D. It is soluble
3. A fibre with diameter 0.50 mm snaps under a force of 39.2 N. What is its tensile strength to 2 significant figures?
- A. 2.0 × 10⁸ Pa
- B. 7.8 × 10⁷ Pa
- C. 2.0 × 10⁵ Pa
- D. 1.6 × 10⁸ Pa
4. Which explains why xylem vessels do not collapse under low pressure?
- A. They contain chloroplasts
- B. They contain sieve plates
- C. They are living cells
- D. Their walls are thickened with lignin
5. A company wants to replace oil-based carrier bags with starch-based film. Which is the best sustainability advantage?
- A. It is made from a renewable resource and is biodegradable
- B. Starch film is always stronger
- C. It needs no land to produce
- D. It never degrades in water