Choose the correct option ($T$-true,$F$-false).
$(I)$ Melting point of oil is lower.
$(II)$ All amino acids are acidic.
$(III)$ Lipid is water soluble.
$(IV)$ Enzyme shows its highest activity at a particular temperature.
$I - II - III - IV$

Which of the following statements are correct?
$(a)$ Proteins are heteropolymers of amino acids.
$(b)$ The sugar found in nucleic acids is of the $\beta$-type.
$(c)$ Nucleic acids exhibit acidic properties.
$(d)$ $5$-methyl uracil is attached to the first carbon atom of the ribose sugar.
$(e)$ Collagen is the most abundant protein found in the plant kingdom.

The given figures represent the nitrogenous bases of nucleic acids. Identify the correct group.

Identify the incorrect pair:

The term "vitamin" was coined by

What does the given structural formula represent?