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241.

Mention two structural differences between amylose and amylopectin.

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242. What are enzymes? Discuss their functions?

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243.

How does DNA differ from RNA with respect to (a) Sugar and (b) base residues?

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244.

What are the different types of RNA found in the cells of organisms? What are their functions?

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245.

How would you convert fructose into glucose?

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246.

What are vitamins? Classify them into water soluble and insoluble vitamins.

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247.

Explain mutarotation. Give its mechanism in case of D-glucose.

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248.

Explain the following:
Denaturation of proteins.

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249.

Which one of the following is a disaccharide: Starch, Maltose, Fructose, Glucose ?

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Fibrous Proteins	Globular Proteins
They are fibre-like structures formed by polypeptide chains. Such proteins are held together by strong hydrogen and disulphide bonds.	The polypeptide chains in these proteins are folded around themselves, giving these proteins a spherical structure.
They are usually insoluble in water.	They are usually soluble in water.
They are structural proteins. For example, keratin is present in nails and hair, collagen is present in tendons and myosin is present in muscles.	They are functional proteins. For example, most enzymes and some hormones like insulin.