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Figure 4 shows a great tit on a bird feeder - Edexcel - GCSE Biology Combined Science - Question 3 - 2020 - Paper 1
Question 3
Figure 4 shows a great tit on a bird feeder. Scientists have found that great tits living now have longer beaks than great tits living 50 years ago. Genetic analys... show full transcript
Worked Solution & Example Answer:Figure 4 shows a great tit on a bird feeder - Edexcel - GCSE Biology Combined Science - Question 3 - 2020 - Paper 1
Step 1
Give the complementary strand sequence for this DNA template.
Answer
To find the complementary DNA strand, we need to replace each nucleotide with its complementary base: A with T and C with G.
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The given template is:
A T G T T A C G T
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The complementary strand will therefore be:
T A C A A T G C A
Step 2
Which statement correctly describes a DNA molecule?
Answer
The correct statement that describes a DNA molecule is:
C: A double helix with strands joined by hydrogen bonds between bases.
This is accurate as the two strands of DNA are held together by hydrogen bonds formed between the complementary bases.
Step 3