Questions: The agar-gel immunodiffusion results below indicate the unknown animal serum (US) contains horse ( Ho ) antigen.

The agar-gel immunodiffusion results below indicate the unknown animal serum (US) contains horse ( Ho ) antigen.
Transcript text: The agar-gel immunodiffusion results below indicate the unknown animal serum (US) contains horse ( Ho ) antigen.
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Solution

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Solution Steps

Step 1: Analyze the immunodiffusion test results

The image shows an agar-gel immunodiffusion test with a precipitin line forming between the wells containing horse (Ho) antigen and unknown serum (US). This indicates a positive reaction between the antigen and antibody.

Step 2: Interpret the positive reaction

A positive reaction means the unknown serum (US) contains antibodies against the horse (Ho) antigen. This indicates that the unknown serum does _not_ contain the horse antigen itself. If it did, the antibodies would be already bound to the antigen and no precipitin line would form.

Step 3: Determine the validity of the statement

The statement claims the unknown serum _contains_ horse antigen. This contradicts the test results which indicate the presence of _antibodies_ against horse antigen, suggesting the serum is from a species _other_ than horse.

Final Answer: False

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