What does the given structure represent?

Which among the following is incorrect about enzymes?

Which of these are biocatalysts?

What percentage of the total cellular mass is water?

The distinct components of nucleotides are phosphate group, heterocyclic compound and polysaccharide. True or false?

When the direction is specified, then the rate of a reaction is also called its velocity. True or false?

All the elements present in a sample of earth’s crust are also present in a sample of living tissue.

Which of these statements is true about biomolecules?