The diagram shows a section of a DNA molecule - Edexcel - GCSE Biology - Question 5 - 2016 - Paper 1
Question 5
The diagram shows a section of a DNA molecule.
(a) (i) Complete the sentence by putting a cross (✗) in the box next to your answer.
The two scientists who first ma... show full transcript
Worked Solution & Example Answer:The diagram shows a section of a DNA molecule - Edexcel - GCSE Biology - Question 5 - 2016 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The two scientists who first made an accurate model of DNA were D Watson and Crick.
Step 2
State the term used to describe the shape of a DNA molecule.
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Answer
The term used to describe the shape of a DNA molecule is double helix.
Step 3
Describe two ways that a DNA molecule is changed by mutation.
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Answer
Substitution: A single base pair in the DNA sequence is replaced by a different base pair, which can change a specific amino acid in a protein.
Insertion or Deletion: One or more base pairs are added or removed from the DNA sequence, which can lead to a frameshift mutation and significantly alter the protein produced.
