Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown & one blank component " X" in it.

Category	Compound
Cholesterol	Guanine
Amino acid	NH2
Nucleotide	Adenine
Nucleoside	Uracil

Distinguish between nitrogenous base and a base found in inorganic chemistry.

What is a prosthetic group?

What is meant by activation energy?

Distinguish between Reducing sugars and Nonreducing sugars.

What are the three types of RNA?

What is tRNA?

Are reducing sugars different from non-reducing sugars? Yes means give reason.

Why are starch and glycogen more suitable than glucose as storage product?

Starch is not a single material, but is regarded as a homopolysaccharide prove the statement.