Which one gives blue colour with iodine_______________?
Correct answer: A. Starch
- A. Starch
- B. Glycogen
- C. Cellulose
- D. Polysaccharide
Explanation
Iodine forms a blue to blue-black complex with the helical structure of amylose in starch. Students may choose glycogen because it is also a polysaccharide, but glycogen gives a reddish-brown colour with iodine rather than the characteristic blue colour of starch.
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