Biology · BIOMOLECULES

Starch gives a blue colour with iodine (\( \text{I}_2 \)), but cellulose does not give this test. What is the precise structural basis for this difference?

Starch forms helical secondary structures that can trap \( \text{I}_2 \) molecules in the helical portion, whereas cellulose does not contain complex helices.
Cellulose is an unbranched polymer of galactose which chemically degrades \( \text{I}_2 \).
Starch has free carboxylic groups that react covalently with iodine to form a blue pigment.
Cellulose is a heteropolymer with charged subunits that repel electronegative iodide ions.

Correct answer · Option 1

Starch forms helical secondary structures that can trap \( \text{I}_2 \) molecules in the helical portion, whereas cellulose does not contain complex helices.

Explanation

Starch forms helical secondary structures capable of holding \( \text{I}_2 \) within the helix, producing a blue colour. Cellulose lacks these helices and cannot hold \( \text{I}_2 \).

Starch gives a blue colour with iodine (\( \text{I}_2 \)), but cellulose does not give this test. What is the precise structural basis for this difference?

Correct answer · Option 1

Explanation

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Starch gives a blue colour with iodine (\( \text{I}_2 \)), but cellulose does not give this test. What is the precise structural basis for this difference?

Correct answer · Option 1

Explanation

Related questions

ऑनलाइन कंप्यूटर आधारित परीक्षा

उपयोगी लिंक

महत्वपूर्ण पेज

कोर्सेज और अभ्यास

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