William has an allergy that causes problems - VCE - SSCE Biology - Question 4 - 2010 - Paper 1
Question 4
William has an allergy that causes problems. Eight skin-prick tests were carried out to find the source of the problem. A portion of skin was divided into eight squa... show full transcript
Worked Solution & Example Answer:William has an allergy that causes problems - VCE - SSCE Biology - Question 4 - 2010 - Paper 1
Step 1
William is allergic to saline.
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Answer
This statement is false. William did not show a positive reaction to saline.
Step 2
histamine is a negative control.
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Answer
This statement is true as histamine typically elicits a positive reaction, confirming the test's validity.
Step 3
William is allowed to keep his cat.
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Answer
This statement is true because there was no positive reaction to the skin prick test for the cat.
Step 4
the same allergen is found in a horse and a house dust mite.
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Answer
This statement cannot be confirmed as both the horse and house dust mite caused a positive reaction, indicating William is allergic to both, but not necessarily the same allergen.
