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Figure 2 shows part of a DNA molecule - Edexcel - GCSE Biology - Question 2 - 2018 - Paper 1
Question 2
Figure 2 shows part of a DNA molecule. (a) (i) What is the shape of a DNA molecule? A single helix B double helix C complementary helix D triple helix (ii) Wh... show full transcript
Worked Solution & Example Answer:Figure 2 shows part of a DNA molecule - Edexcel - GCSE Biology - Question 2 - 2018 - Paper 1
Step 1
What is the shape of a DNA molecule?
Answer
The shape of a DNA molecule is the double helix. This structure consists of two strands that twist around each other, forming a spiral shape. This configuration is crucial for the DNA's function, as it allows for the storage of genetic information and the replication process.
Step 2
Which molecules are present in the DNA backbone?
Answer
The DNA backbone is primarily composed of sugars and phosphates. Specifically, the sugar component is deoxyribose, and it alternates with phosphate groups to form the structural framework of the DNA molecule. This backbone supports the nitrogenous bases that carry the genetic information.