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Question 1
A bench analyst dabs a stain with filter paper, adds phenolphthalin reagent, then hydrogen peroxide, and the paper turns bright pink within seconds. What does this result indicate?
Correct Answer:
Presumptive positive for blood (peroxidase activity)
Question 2
Why must hydrogen peroxide be added AFTER the phenolphthalin reagent during a Kastle-Meyer test rather than simultaneously?
Correct Answer:
To prevent false-positive color from atmospheric oxidation of reduced phenolphthalin
Question 3
An analyst sprays luminol on a cleaned floor and photographs a faint blue-white chemiluminescence. Which statement most accurately describes the limitation of this result?
Correct Answer:
It is a presumptive reaction prone to false positives from bleach, copper, and some plant peroxidases
Question 4
Which presumptive blood reagent is marketed as more sensitive than luminol while producing less interference from bleach and copper backgrounds?
Correct Answer:
Bluestar Forensic
Question 5
A Takayama test on a suspected bloodstain produces salmon-pink rhombic crystals under the microscope. What does this confirm?
Correct Answer:
Hemoglobin (hemochromogen crystals)
Question 1
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About this Exam

Prepare with the ABC-BIO Practice Questions - ABC Biological Evidence Screening Certification (ABC-BIO) Exam practice quiz. This question bank includes 100 questions covering presumptive, reagent, blood, analyst, and evidence. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ABC-BIO Practice Questions - ABC Biological Evidence Screening Certification (ABC-BIO) Exam

This practice set contains 100 questions from the matching question bank and focuses on presumptive, reagent, blood, analyst, and evidence. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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