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Branched Coiled Describe Explain Features Starch Make Good

Starch is an effective storage molecule due to its insolubility, compact helical structure for dense packing, provision of glucose for respiration, and branching that allows for quick enzymatic breakdown.

Starch is a good storage molecule because it is insoluble, preventing osmotic issues; it is compact or coiled, allowing high density storage; it provides glucose for respiration; and its branching allows rapid enzyme breakdown.

Front Describe and explain two features of starch that make it a good storage molecule. (2 marks)
Back Any two from:
1. Insoluble (in water), so doesn't affect water
potential;
2. Branched / coiled / (α-)helix, so makes
molecule compact;
OR
Branched / coiled / (α-)helix so can fit many
(molecules) in small area;
3. Polymer of (α-)glucose so provides glucose for
respiration;
4. Branched / more ends for fast breakdown /
enzyme action;
5. Large (molecule), so can't cross the cell
membrane

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