The most common free ion in a cell is:

Column-$I$ contains some terms and Column-$II$ contains their meanings. Match them properly and choose the right answer.

Column-$I$	Column-$II$
$A$. Glycogenesis	$1$. Conversion of glycogen to glucose
$B$. Glycosuria	$2$. Conversion of glucose to glycogen
$C$. Gluconeogenesis	$3$. Excretion of glucose in urine
$D$. Glycogenolysis	$4$. Conversion of non-carbohydrate sources to glucose
	$5$. Conversion of glucose to starch

The vitamin containing a cobalt-cyanide linkage is:

Match the following:

$(a)$ Inhibitor of catabolic reaction	$(i)$ Ricin
$(b)$ Contains peptide bond	$(ii)$ Malonate
$(c)$ Cell wall material in fungi	$(iii)$ Chitin
$(d)$ Secondary metabolite	$(iv)$ Collagen

Select the correct option:

How many covalent bonds are present in the water molecules shown in the given figure?

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.