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Difficulty: MediumEvidence for Evolution: Comparative Biochemistry and Biogeography

Immunological serological tests demonstrate high precipitin cross-reactivity when human antibodies are mixed with chimpanzee serum proteins, indicating close structural homology resulting from a recent common evolutionary ancestor. Is this statement True or False?

Answer: Answer

Answer

True
The statement is true because comparative serology utilizes antigen-antibody reactions to quantify biochemical similarity. High precipitin formation between human anti-serum and chimpanzee serum proteins demonstrates that their plasma proteins share extremely similar amino acid sequences, providing strong molecular evidence for a recent common ancestor.

Step-by-Step Solution

1
Analyze the principle of comparative serology in evolutionary biochemistry.
Serum proteins (such as albumin and globulins) evolve through gene mutations over long periods. Closely related species share highly similar protein structures.
Fewer structural protein differences accumulate when organisms share a recent common ancestor.
2
Evaluate the mechanism of the precipitin test in cross-reactivity.
Antibodies produced against human serum proteins bind specifically to homologous protein epitopes in chimpanzee serum, causing high precipitation.
Antigen-antibody binding affinity increases with protein structural similarity.
3
Determine the validity of the statement based on biochemical evidence.
High cross-reactivity confirms a high degree of biochemical homology and recent shared ancestry.
The statement accurately describes the biochemical evidence for primate evolution.

Key Concept

Comparative serology and immunological cross-reactivity as evidence for evolutionary relationships
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Topics

Evidence for Evolution: Comparative Biochemistry and Biogeography

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