Which of the following is a correct sequence for the appearance of compounds in a cell?

Assertion $A$: Living organisms obtain various molecules and elements from their environment.
Reason $R$: Living organisms synthesize components essential for their body.
Which option is correct for Assertion $A$ and Reason $R$?

Which of the following bonds is $NOT$ formed in an organic compound?

Match the following chemical linkages with their respective types:

Column-$I$	Column-$II$
$(1) -C-O-C-$	$(a)$ Phosphodiester bond
$(2) -C-O-O-C-$	$(b)$ Glycosidic bond
$(3) -C-NH-CO-$	$(c)$ Ester bond
$(4) -C-O-P-O-C-$	$(d)$ Peptide bond

The most common free ion in a cell is:

Assertion $(S)$: The measure of disorder in a biological system is called free energy.
Reason $(R)$: The energy available in a biological system to perform work is called entropy.
$(A)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(B)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(C)$ $S$ is true and $R$ is false.
$(D)$ $S$ is false and $R$ is true.
$(E)$ Both $S$ and $R$ are false.