$A$ drug effective in the treatment of pneumonia,bronchitis,etc.,is

Explain the role of the allosteric site in enzyme inhibition.

Assertion $(A)$: Shape of the receptor changes after attachment of chemical messenger.
Reason $(R)$: Receptor does not regain original shape after removal of chemical messenger.
The correct answer is

The following type of non-ionic detergent is present in liquid detergents,emulsifying agents,and wetting agents. Label the hydrophilic and hydrophobic parts in the molecule. Identify the functional group$(s)$ present in the molecule.
$C_9H_{19}-C_6H_4-O(CH_2CH_2O)_xCH_2CH_2OH$ $(x = 5 \text{ to } 10)$

Which of the following is not a broad-spectrum antibiotic?

Aspirin is known as ......?