The one which is present in all living things
Correct answer: B. DNA or RNA
- A. Cell nucleus
- B. DNA or RNA
- C. Cell membrane
- D. Vacuole
Explanation
All cellular living organisms contain genetic material, with DNA serving as the hereditary material and RNA functioning in gene expression; the phrase DNA or RNA also covers the genetic-material distinction used for biological systems. Students may choose cell membrane because cells require a boundary, but the wording includes all living things and does not state that every living structure must have a membrane as its defining common feature.
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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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