Short Answer Type

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How do you explain the amphoteric behaviour of amino acids?


In aqueous solution, the carboxyl group of an amino acid can lose a proton and the amino group can accept a proton to give a dipolar ion known as zwitter ion.
Therefore, in zwitter ionic form, the amino acid can act both as an acid and as a base. Thus, amino acids show amphoteric behaviour.

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Long Answer Type

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

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Short Answer Type

What are nucleic acids? Mention their two important functions.

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

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Differentiate between globular and fibrous proteins. 

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

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

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What is the difference between a nucleoside and a nucleotide?

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

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What are the common types of secondary structure of proteins?

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