The stored blood must be free from

Which of the following is $NOT$ a characteristic of a good antibiotic?

The polypeptide chains in the structure of an antibody are held together by .........

$A$ person showing unpredictable moods, outbursts of emotion, quarrelsome behaviour and conflicts with others is suffering from

Skin is a:

Whether a nation can produce sportsmen who could compete successfully in the Olympics is decided by: