Which of these artificial sweeteners is unstable at cooking temperature?

What type of detergent is $Cetyl \ trimethyl \ ammonium \ chloride$?

Veronal,a barbiturate drug,is used as:

Identify the pair of drugs which act as antihistamines.

Which of the following statements are correct?
$I$. Binding of inhibitor at allosteric site changes the shape of the active site.
$II$. Shape of the receptor does not change after attachment of chemical messenger to it.
$III$. $A$ chemical messenger gives message to the cell by entering it.
$IV$. Erythromycin is an example of bacteriostatic antibiotic.

Name a sweetening agent used in the preparation of sweets for a diabetic patient.