Which element among the following is not present in saccharin?

Which of the following bacteria are responsible for intestinal inflammation and urinary tract infections?

Match List-$I$ and List-$II$

List-$I$	List-$II$
$A$. Molisch's Test	$I$. Peptide
$B$. Biuret Test	$II$. Carbohydrate
$C$. Carbylamine Test	$III$. Primary amine
$D$. Schiff's Test	$IV$. Aldehyde

Choose the correct answer from the options given below:

Which of the following is the Fischer projection of $L$-threonine (also known as $(2S, 3R)-2$-amino-$3$-hydroxybutanoic acid)?

Assertion : $Mg$ is not present in the enamel of human teeth.
Reason : $Mg$ is an essential element for the biological functions of humans.

The artificial sweetener $X$ contains a glycosidic linkage and $Y$ contains amide and ester linkages. $X$ and $Y$ respectively are: