What are main classes of vitamins?

Vitamins are classified into two main classes.

(i)    Water-soluble , e.g., biotin., niacin, vitamin B & C.

(ii)    Fat-soluble , These include vitamins A, D, E and K.

Define co-enzymes?

Vitamins and their derivatives often serve as cofactors for enzymes. Vitamin cofactors are called as co-enzymes.

Does antibiotic therapy affect vitamins?

It causes deficiency of vitamins.

Write the name of co-factors required for function of vitamin Niacin and Riboflavin?

Niacin requires Nicotinamide-adenine dinucleotide and its phosphate i.e., NAD and NADP as cofactors.

Riboflavin needs flavin mononucleotide & flavin dinucleotide (FMN & FDN) as co-factors.