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The photograph shows a sperm cell and an egg cell just before fertilisation - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Question 2
The photograph shows a sperm cell and an egg cell just before fertilisation. (a) Which row describes the sperm cell and the egg cell before fertilisation? Place a... show full transcript
Worked Solution & Example Answer:The photograph shows a sperm cell and an egg cell just before fertilisation - Edexcel - GCSE Biology - Question 2 - 2015 - Paper 1
Step 1
Step 2
Describe the structure of DNA.
Answer
The structure of DNA is a double helix. The sides of DNA are made from alternating sugars and phosphate molecules, creating a sugar phosphate backbone. DNA consists of paired bases, where adenine (A) pairs with thymine (T), and cytosine (C) pairs with guanine (G). The bases are joined by hydrogen bonds to form the double helix structure.