All of the following are mono nucleotides except:
Correct answer: D. FAD
- A. AMP
- B. ATP
- C. ADP
- D. FAD
Explanation
A nucleotide is an organic molecule that is composed of a nitrogenous base, a five-carbon sugar, and a phosphate group. A mononucleotide contains only one phosphate group. FAD (flavin adenine dinucleotide) is not a mononucleotide because it contains two nucleotide units (adenine and riboflavin) that are connected by a phosphate group bridge, making it a dinucleotide. This is why FAD is the correct answer, while the other options (AMP, ATP, ADP) are all mononucleotides.
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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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