Photo AI
Use the Data Booklet to help you answer these questions - AQA - A-Level Chemistry - Question 9 - 2017 - Paper 2
Question 9
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
Step 2
Complete the diagram below to show the other molecule and the hydrogen bonds between it and adenine.
Answer
To complete the diagram, draw a thymine molecule (which is complementary to adenine) with appropriate hydrogen bonds:
-
Structure of thymine includes:
- A double-bonded oxygen (C=O) on one end.
- A nitrogen atom (N) bonded to a hydrogen (NH) group.
- Another double-bonded oxygen (C=O) away from the hydrogen bond.
-
Position thymine so that it aligns with adenine, showcasing the hydrogen bonds (Adenine has NH groups that hydrogen bond with the carbonyl (C=O) of thymine).
-
Ensure both structures are cleanly connected to illustrate the hydrogen bonding.