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Biology · BIOMOLECULES

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Which of the following compounds is a nucleotide, and how does it structurally differ from a nucleoside?

  1. Adenosine; contains a nitrogen base linked to phosphate without a ribose sugar
  2. Uridine; contains a heterocyclic nitrogen base esterified directly to a phosphate group
  3. Cytidine; contains three phosphate groups attached directly to the pyrimidine ring
  4. Uridylic acid; contains a phosphate group esterified to the sugar of a nucleoside

Correct answer · Option 4

Uridylic acid; contains a phosphate group esterified to the sugar of a nucleoside

Explanation

Adenosine, uridine, and cytidine are nucleosides (nitrogen base + sugar). When a phosphate group is esterified to the sugar moiety of a nucleoside, it forms a nucleotide, such as uridylic acid or adenylic acid.

Related questions

Based on the average cellular composition of living tissues, arrange the following components in descending order of their percentage of total cellular mass:\nI. Nucleic acids II. Carbohydrates III. Proteins IV. Lipids→Given below are two statements: Statement I: The ash remaining after completely burning a living tissue sample contains inorganic compounds such as sulphate and phosphate in addition to inorganic ions. Statement II: Elemental analysis gives the elemental composition of living tissues, whereas compound analysis gives an idea of organic and inorganic constituents. In the light of the above statements, choose the most appropriate answer from the options given below:→Which of the following carbohydrates is a polymer of fructose?→Consider the following statements about protein structure: (A) In a polypeptide chain, the first amino acid is designated as the C-terminal amino acid. (B) In proteins, only right-handed helices are observed in the secondary structure. (C) Collagen is the most abundant protein in the animal world. (D) RuBisCO is the most abundant protein in the entire biosphere. (E) All proteins are homopolymers composed of repeating units of a single amino acid. Choose the correct answer from the options given below:→
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