The molecules of living matter that provide building blocks are mostly based on:
Correct answer: A. Carbon
- A. Carbon
- B. Nitrogen
- C. Hydrogen
- D. Ammonia
Explanation
Carbon forms four covalent bonds and can make stable chains, rings, and complex structures, allowing it to serve as the backbone of carbohydrates, lipids, proteins, and nucleic acids. Nitrogen and hydrogen are important elements but do not provide the same versatile framework for most biological molecules. Students may choose nitrogen because it is present in proteins and nucleic acids, but carbon is the principal structural basis.
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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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