What property of water is demonstrated by this arrangement?

Given below are two statements:
Statement $I$: Low temperature preserves the enzyme in a temporarily inactive state,whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement $II$: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme,it is known as a competitive inhibitor.
In the light of the above statements,choose the correct answer from the options given below:

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

Refer to the given structure of adenylic acid. In this,identify $A$.

Which of the following is not a member of the $Vitamin$ $B$ complex group?

The energy released by metabolic processes in the cell is immediately stored in the form of .........