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IB Biology SL A1.2.2 Components of a Nucleotide Questions

Identify the phosphate group, pentose sugar and nitrogenous base in a nucleotide. Compare deoxyribose in DNA with ribose in RNA, and classify A and G as purines and C, T and U as pyrimidines.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify the phosphate group, pentose sugar and nitrogenous base that make up a nucleotide.
  • Distinguish deoxyribose in DNA from ribose in RNA, and classify A/G as purines and C/T/U as pyrimidines.

IB Biology SL A1.2.2 Components of a Nucleotide Questions question 1

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The diagram below represents a DNA nucleotide.

Figure for Question IB Biology SL A1.2.2 Components of a Nucleotide Questions question 1 — IB Biology SL

Identify the phosphate group and deoxyribose.

Phosphate group:
Deoxyribose:

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