BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Just four of these – carbon (C), oxygen (O), hydrogen (H) and nitrogen (N) – make up about 96% of the human body. 25 elements are known to be essential to life.

Detailed explanation-2: -In all living systems we can always find 4 basic elements: carbon, oxygen, nitrogen and hydrogen. Carbon is the basic building unit contained in living matter. The percentage of carbon in the mass of living matter is 19.4 %.

Detailed explanation-3: -The four most abundant elements that are found in living organisms (hydrogen, oxygen, carbon and nitrogen) are indicated by dark color.

Detailed explanation-4: -The four elements common to all living organisms are oxygen (O), carbon (C), hydrogen (H), and nitrogen (N). In the non-living world, elements are found in different proportions, and some elements common to living organisms are relatively rare on the earth as a whole, as shown in Table 1.

Detailed explanation-5: -Major bio-macromolecules (proteins, carbohydrates, lipids and nucleic acids) found in the body of all living organisms on Earth are made up mostly by chemically combining carbon, hydrogen, oxygen and nitrogen.