Which of the following statements are correct?
$(A)$ $A$ tripeptide has two peptide bonds.
$(B)$ $A$ pentapeptide contains five amino acids.
$(C)$ Nucleotide is a product of base and sugar.
$(D)$ In cellulose,$\beta$-glycosidic linkages are present.

Assign "$T$" for a true statement and "$F$" for a false statement,then select the correct option.
$(i)$ Most naturally occurring amino acids have $L$-configuration.
$(ii)$ $\beta-D$-ribose sugar is present in $RNA$.
$(iii)$ Amylose is a water-insoluble component made up of $\alpha-D^+$-glucose units.
$(iv)$ All monosaccharides are non-reducing sugars.

Assertion : $DNA$ as well as $RNA$ molecules are found in the nucleus of a cell.
Reason : On heating,the enzymes do not lose their specific activity.

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

The tripeptide is written as Glycyl-Alanyl-Glycine. What is its correct structure?

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