Cytochrome-c is a protein found in most organisms - VCE - SSCE Biology - Question 21 - 2007 - Paper 1
Question 21
Cytochrome-c is a protein found in most organisms. The amino acid sequence of this protein varies between species. The numbers of differences in the amino acid seque... show full transcript
Worked Solution & Example Answer:Cytochrome-c is a protein found in most organisms - VCE - SSCE Biology - Question 21 - 2007 - Paper 1
Step 1
A.
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Answer
This option suggests a direct relationship between species A and B, which fails to consider the closer relationship between species A and C as indicated by the fewer differences in their amino acid sequences.
Step 2
B.
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This option accurately reflects the relationships seen in the data. Species A displays fewer differences with species C (3) than with species B (11), suggesting that A and C share a more recent common ancestor compared to A and B.
Step 3
C.
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This option places species A and B as equally related to species C, which misrepresents the data, as species A differs less from species C than from species B.
Step 4
D.
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This option suggests that species B is closer to both A and C, which contradicts the findings, as A is more closely related to C.
