It is said that elemental composition of living organisms and that of inanimate objects (like earth’s crust) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups? Choose a correct answer from among the following.
 

Many elements are found in living organisms either free or in the form of compounds. One of the following is not found in living organisms.

1. Silicon

2. Magnesium

3. Iron

4. Sodium

When we homogenise any tissue in an acid, the acid-soluble pool represents

1. cytoplasm 

2. cell membrane

3. nucleus

4. mitochondria

The most abundant chemical in living organisms could be

1.  protein 

2.  water

3.  sugar

4.  nucleic acid