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MBBS QUESTION #10313
Question 1
A nucleoside differs structurally from a nucleotide in that a nucleoside consists of:
  • A nitrogenous base plus a phosphate group, without any sugar component
  • A nitrogenous base linked to a pentose sugar, without an attached phosphate group✔️
  • Only a phosphate group and a sugar, without a nitrogenous base
  • Multiple nucleotides joined together in a chain
Correct Answer Explanation
A nucleoside is simply a base-sugar combination (e.g., adenosine = adenine + ribose); adding one or more phosphate groups to the sugar's 5' position converts it into a nucleotide (e.g., adenosine monophosphate).