2 (a) DNA molecules contain base pairs - Edexcel - GCSE Biology - Question 2 - 2022 - Paper 1
Question 2
2 (a) DNA molecules contain base pairs.
Describe how the base pairs are bonded together in a DNA molecule.
(b) Figure 1 shows part of a DNA molecule.
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Worked Solution & Example Answer:2 (a) DNA molecules contain base pairs - Edexcel - GCSE Biology - Question 2 - 2022 - Paper 1
Step 1
Describe how the base pairs are bonded together in a DNA molecule.
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Answer
Base pairs in a DNA molecule are held together by weak hydrogen bonds between complementary bases. The pairs consist of adenine (A) bonding with thymine (T), and cytosine (C) bonding with guanine (G). This specific pairing ensures the stability and integrity of the DNA double helix structure.
Step 2
Write the code for the complementary DNA strand in Figure 1.
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Answer
A A C T A A C G C A T T T
Step 3
Which is the maximum number of amino acids coded for by this strand of DNA?
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Answer
B 4
Step 4
What is the shape of a DNA molecule?
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