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Starch

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Question

Read the following statements (a-d) and choose the option with only correct statements.
(a) Left end of glycogen is reducing and right end is non-reducing end.
(b) Starch can hold iodine molecules in its helical secondary structures.
(c) Starch is a variant of cellulose but present as a storehouse of energy in plant tissues.
(d) Starch-Iodine is red in colour.

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Solution

Answer (2)
Right end of polysaccharides is reducing and left end is non-reducing end. Starch-Iodine is blue in colour.

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Q. Read the following statements:
i) Chitin, starch, glycogen and agar-agar are homopolymers ii) In a glycogen, the left end is called the non-reducing end
iii) Starch forms helical secondary structures but cellulose does not contain complex helices.
iv) Cellulose Can easily hold iodine.
v) Chitin is a storage polysaccharide How many of the above statements are correct?

Read the given statements and select the correct option.
i.Right end of a polysaccharide chain is called reducing end while left end is called non-reducing end.
ii.Starch can hold iodine molecules in its helical secondary structure but cellulose being non-helical, cannot hold iodine.
iii.Starch and glycogen are branched molecules.
iv.Starch and glycogen are the reserve food materials of plants and animals, respectively.

Q. Which of the following statements are correct?
(i) Chitin, a complex or heteropolysaccharide occuring in the exoskeleton consists of NAG.
(ii) Glucosamine and N-acetyl glucosamine (NAG) are modified sugars.
(iii) Cellulose shows blue colour when treated with Iodine.
(iv) Starch in plants and glycogen in animals are store houses of energy.
(v) Right end of polysaccharide is called the reducing end while the left end is called non-reducing end.

Q. Starch gives blue colour with iodine but why glycogen doesn't? As both have helical structure

Study the given statements and select the correct answer.
(i)Cellulose is a homopolymer of glucose.
(ii)Inulin is a homopolymer of fructose.
(iii)Starch gives blue colour and glycogen gives red colour with iodine solution.

(iv)Cellulose gives no colour with iodine solution.

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