Multiple choice

Which of the following statements is/are correct?

a. Oxygen is an essential component of most biological molecules like carbohydrates, proteins, nucleic acids and fats (or lipids). b. Oxygen from the atmosphere is used up in the processes of combustion and respiration, and in the formation of oxides of nitrogen. c. The process of nitrogen fixation by bacteria takes place in the presence of oxygen.

  1. Only a

  2. Only b

  3. Only c

  4. Both a and b

  5. a, b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer. Oxygen is an essential component of most biological molecules like carbohydrates, proteins, nucleic acids and fats (or lipids). Oxygen from the atmosphere is used up in the processes of combustion and respiration, and in the formation of oxides of nitrogen.

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