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Use the Data Booklet to help you answer these questions - AQA - A-Level Chemistry - Question 9 - 2017 - Paper 2

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Use the Data Booklet to help you answer these questions. DNA exists as two strands of nucleotides in the form of a double helix with hydrogen bonding between the tw... show full transcript

Worked Solution & Example Answer:Use the Data Booklet to help you answer these questions - AQA - A-Level Chemistry - Question 9 - 2017 - Paper 2

Step 1

Name the types of group attached to 2-deoxyribose at positions X and Y.

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Answer

X - base
Y - phosphate group

Step 2

Complete the diagram below to show the other molecule and the hydrogen bonds between it and adenine.

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Answer

To complete the diagram, draw an appropriate thymine structure adjacent to adenine, ensuring to include:

  • The correct orientation of thymine.
  • Hydrogen bonds represented between the nitrogen atoms in both adenine and thymine.

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