Which of the following is an example of "molecule"?
Correct answer: C. DNA
- A. Chloroplast
- B. A Nerve Cell
- C. DNA
- D. Hydrogen
Explanation
DNA is a very large molecule made of repeating nucleotide units, and each nucleotide contains a sugar, phosphate group, and nitrogenous base. A chloroplast and nerve cell are cellular structures, while hydrogen is an element rather than a named molecule in this context. Students may choose hydrogen because hydrogen gas exists as H2 molecules, but the option normally refers to the element.
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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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