Question

About 98 percent of the mass of every living organism is composed of just six elements including carbon, hydrogen, nitrogen, oxygen and
A. phosphorus and sulphur
B. sulphur and magnesium
C. magnesiurn and sodium
D. calcium and phosphorus

Answer 1

Correct Answer - A
About 98% of the mass of every living organism including bacterium and human beings is composed of just six elements, i.e. Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (0), Phosphorus (P) and Sulphur (S).
Charagaff (1950) suggested that despite wide compositional variations exhibited by different types of DNA the total amount of purines equaled the total amount of pyrimidines (A+ G = T + C).