How many atoms of $H$ and $O$ are present in one molecule of water,respectively?

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:

Which of the following represents the correct structure of cytosine?

Synthesis of glycogen from sugar in the liver is known as

In the given figure,what is the bond angle represented by '$a$' (in $^\circ$)?

Which of the following is $NOT$ included in inorganic compounds?