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 Multiple Choice QuestionsShort Answer Type

121.

What are essential and non-essential amino acid? Give two examples of each type.

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 Multiple Choice QuestionsLong Answer Type

122.

Define the following as related to proteins:
(i) Peptide linkage     (ii) Primary structure    (iii) Denaturation. 

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 Multiple Choice QuestionsShort Answer Type

123.

What are the common types of secondary structure of proteins?

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124.

Differentiate between globular and fibrous proteins. 

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125.

How do you explain the amphoteric behaviour of amino acids?

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126.

What is the effect of denaturation on the structure of proteins?


Denaturation of proteins: Proteins are very sensitive to the action of heat, change of pH, presence of electrolytes and radiations (particularly of short wavelength). Whenever proteins are subjected to such changes in the surroundings, they undergo some structural changes leading to disruption of three dimensional structure. This causes permanent loss of activity to proteins. Disruption of the native conformation of protein, by changing its environment, resulting in loss of its biological activity, is known as denaturation of proteins.

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127.

How are vitamins classified? Name the vitamin responsible for the coagulation of blood.

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128.

Why are vitamin A and vitamin C essential to us? Give their important sources.

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129.

What are nucleic acids? Mention their two important functions.

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130.

What is the difference between a nucleoside and a nucleotide?

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