Which one of them is a micro-molecule?
Correct answer: D. ATP
- A. Polysaccharide
- B. Protein
- C. Hemoglobin
- D. ATP
Explanation
ATP is a relatively small molecule made from adenine, ribose, and three phosphate groups, and it transfers energy directly in cells. Proteins, hemoglobin, and polysaccharides are macromolecules, so choosing protein or hemoglobin confuses a small metabolic molecule with a large biological polymer.
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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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