Which class of organic molecule forms the greatest proportion of the dry mass of a typical cell?
Correct answer: B. Proteins
- A. Carbohydrates
- B. Proteins
- C. Lipids
- D. Nucleic acids
Explanation
Proteins account for roughly half the dry mass because they serve as enzymes, transporters, receptors, antibodies and structural fibres all at once, so a cell needs thousands of different ones. Carbohydrates and lipids are present in large amounts too but fill a narrower range of roles, mainly energy and structure. Nucleic acids are a small fraction by mass despite controlling everything else.
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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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