In human body 99% of total mass is formed of_____________?
Correct answer: D. 6 Bio-elements
- A. 16 Bio-elements
- B. 12 Bio-elements
- C. 10 Bio-elements
- D. 6 Bio-elements
Explanation
About 99% of the human body's mass is contributed by six elements: oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. The other bio-elements are essential but occur in much smaller quantities. Students may choose 12 or 16 bio-elements by confusing the number of biologically important elements with the six that contribute nearly all body mass.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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