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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 strand for the DNA template sequence given as
A T G T T A C G T,
the complementary bases are:
- A (adenine) pairs with T (thymine)
- T pairs with A
- G (guanine) pairs with C (cytosine)
- C pairs with G,
Thus, the complementary strand sequence is:
T A C A A T G C A.
Step 2
Which statement correctly describes a DNA molecule?
Answer
The correct statement is:
C a double helix with strands joined by hydrogen bonds between bases.
This is accurate because DNA molecules consist of two strands that coil around each other to form a double helix, with hydrogen bonds connecting the complementary base pairs.
Step 3