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Questions and Answers
What is the principle of the Benzidine test?
What is the principle of the Benzidine test?
- The haem group of haemoglobin possesses a peroxidase-like activity which catalyses the breakdown of hydrogen peroxide (correct)
- The formation of haemoglobin derivative crystals such as haematin, haemin and haemochromogen
- The sensitivity of the test to detect bloodstains
- The reaction of haemoglobin with Nippe’s Reagent
What can cause false positives in crystal tests?
What can cause false positives in crystal tests?
- Substances other than heme which possess a similar peroxidase-like activity (correct)
- The sensitivity of the test
- The presence of haemoglobin derivative crystals
- Chemical oxidants
What is the sensitivity of crystal tests to detect haemoglobin?
What is the sensitivity of crystal tests to detect haemoglobin?
- About 0.1 mL of blood or 0.01 mg of haemoglobin
- About 0.01 mL of blood or 1 mg of haemoglobin
- About 1 mL of blood or 0.001 mg of haemoglobin
- About 0.001 mL of blood or 0.1 mg of haemoglobin (correct)
What is the composition of Nippe’s Reagent?
What is the composition of Nippe’s Reagent?
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What is the procedure for the Benzidine test?
What is the procedure for the Benzidine test?
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