Question

Following are the examples of primary metabolites, except
(a)Lecithin
(b)Cholesterol
(c)Triglyceride
(d)Cellulose

Answer 1

Hint: This is the secondary metabolite occurring in the plant and animal tissue and is amphiphilic in nature. Originally it was isolated from the egg yolk by a French chemist Theodore Gobley in 1845.

Complete answer:
Primary metabolism, also called trophophase, is characterized by the balanced growth of microorganisms.
They occur when all the nutrients needed are present in the medium. During this phase, the exponential growth of microorganisms is seen and several metabolic products are known as primary metabolites that are produced like lactic acid, amino acids.
Lecithin is not a primary metabolite.
When the exponential growth of microorganisms ceases which is when the trophophase ends they enter idiophase which is called secondary metabolism where the formation of the metabolites is referred to as the secondary metabolites.

Additional Information:
 Characteristics of secondary metabolites-
-They are specific and are produced by certain microorganisms.
-These are not essential for the growth and reproduction of organisms from which they are not formed.
-Production of secondary metabolites is influenced by environmental factors.

So, the correct answer is, ‘Lecithin.’

Note: As secondary metabolites are not essential for the growth and multiplication of cells. Their occurrence and structure have a lot of variation. Lecithin can be extracted by using chemical solvents hexane, ethanol, acetone, and benzene.