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Use the Data Booklet to help you answer this question about DNA - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 2
Question 9
Use the Data Booklet to help you answer this question about DNA. Figure 2 shows a fragment of a DNA double helix. The letters A, C, G and T represent the four bases ... show full transcript
Worked Solution & Example Answer:Use the Data Booklet to help you answer this question about DNA - AQA - A-Level Chemistry - Question 9 - 2018 - Paper 2
Step 1
Step 2
Deduce the total number of hydrogen bonds formed between the five bases in each strand.
Answer
Each base pair forms hydrogen bonds as follows:
- A and T form 2 hydrogen bonds.
- C and G form 3 hydrogen bonds.
For the sequence:
- A to T (2 bonds)
- C to G (3 bonds) Thus, the total number of hydrogen bonds formed between the five bases in each strand is 13.
Tick (✓) 13.
Step 3
Complete the structure to show the nucleotide that contains base A.
Answer
The structure of the nucleotide that contains base A includes:
- A phosphate group attached to the 2-deoxyribose molecule.
- Base A represented as A, connected to the 2-deoxyribose.
The full structure will be:
- Phosphate → 2-Deoxyribose → A
Refer to the correct positioning and connection in the provided structure.