Differentiate between globular and fibrous proteins.

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Solution

Fibrous protein

Globular protein

1.

It is a fibre-like structure formed by the polypeptide chain. These proteins are held together by strong hydrogen and disulphide bonds.

1.

The polypeptide chain in this protein is folded around itself, giving rise to a spherical structure.

2.

It is usually insoluble in water.

2.

It is usually soluble in water.

3.

Fibrous proteins are usually used for structural purposes. For example, keratin is present in nails and hair; collagen in tendons; and myosin in muscles.

3.

All enzymes are globular proteins. Some hormones such as insulin are also globular proteins.

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QUESTION 14.15

Differentiate between globular and fibrous proteins.

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Fibrous protein		Globular protein
1.	It is a fibre-like structure formed by the polypeptide chain. These proteins are held together by strong hydrogen and disulphide bonds.	1.	The polypeptide chain in this protein is folded around itself, giving rise to a spherical structure.
2.	It is usually insoluble in water.	2.	It is usually soluble in water.
3.	Fibrous proteins are usually used for structural purposes. For example, keratin is present in nails and hair; collagen in tendons; and myosin in muscles.	3.	All enzymes are globular proteins. Some hormones such as insulin are also globular proteins.