FRSC 2030 Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) National DNA Data Bank total offender hits since 2000 - Correct Answers ✅65,568 True or False, DNA collected from a biological sample at a crime scene can provide absolute proof of guilt if it matches a suspect? - Correct Answers ✅false, DNA can exclude an individual but can't prove it came from an individual, if dna profile matches you must consider the chances that there is an identical dna profile in the population Forensic scientist should - Correct Answers ✅put physical evidence into context, not prove innocence or guilt more context acquired for evidence - Correct Answers ✅the better Purpose of Presumptive Test - Correct Answers ✅help provide initial context at crime scenes as to where biological stains are (despite having been cleaned, diluted, or if they are clear/colourless and hard to see), what type biological stain is present (e.g., blood, semen, saliva), and the patterns of the biological stains (e.g., for blood spatter analyses
- categories of presumptive tests - Correct Answers
✅colour tests, luminescence tests, and antibody precipitin tests 1 / 4
FRSC 2030 Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) Kastle-Meyer Test - Correct Answers ✅phenolphthalein reacts with the blood's hemoglobin in the presence of hydrogen peroxide and is oxidized from its colorless form to a bright/deep pink color, not human blood specific Hemastix - Correct Answers ✅fast and easy, a strip that has been coated with tetramethylbenzidine (TMB) and will produce a green color with the presence of hemoglobin, not specific to human blood Luminol and bluestar - Correct Answers ✅react with oxidizing agents, such as the heme in blood, to emit light, or luminescence Advantage of luminol/bluestar - Correct Answers ✅finding minute traces of blood, including after a crime scene has been cleaned and can tell if body was moved Drawback of luminol/bluestar - Correct Answers ✅reaction is not specific to blood, and other oxidizing agents like bleach, some metals, and plant material can also cause luminescence with luminol Precipitin Tests - Correct Answers ✅serological tests to detect the presence of a specific antigen, such as human specific blood antigens 2 / 4
FRSC 2030 Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) Hematrace - Correct Answers ✅uses the principles of the precipitin test to detect human heme in hemoglobin antigens How hematrace works - Correct Answers ✅The test works when human hemoglobin antigens react with the monoclonal antihuman antibodies that are labelled with a pink dye.When/if the antigens and antibodies complex, a pink line is formed Tests for Semen - Correct Answers ✅needed because large percentage of cases are sexual assault, microscopic examination of spermatozoa is performed along with presumptive and confirmation tests Presumptive and confirmation semen test - Correct Answers ✅presumptive- acid phosphatase test (colour) confirmation- prostate specific antigen test (human) Acid phosphatase test - Correct Answers ✅high levels in human semen, has chemical activity that changes colour when it detects monophenolic phosphoric acid, can take a a while to react p30 test - Correct Answers ✅Human semen also contains high levels of a substance called p30 or prostate specific antigen, a protein which, with few exceptions, is specific to 3 / 4
FRSC 2030 Final EXAM QUESTIONS AND ANSWERS 100% SOLVED (Newest 2025) semen. The technique is very sensitive in detecting minute amounts of this protein Presumptive tests for saliva - Correct Answers ✅saliva contains alpha-amylase, this enzyme can be detected using the Phadebas test, it turns blue Other bodily fluids that have acid phosphatase - Correct Answers ✅semen and vaginal secretions Why are antibody tests important in identifying bodily fluids beyond just colour tests? - Correct Answers ✅they are often more specific, and less likely to give false positives based on cross-reactivity with other substances DNA - Correct Answers ✅deoxyribonucleic acid is a set of four molecules that all include a sugar backbone, a phosphate group and one of 4 different nucleotide bases (A,
G, C, T)
Nuclear DNA - Correct Answers ✅DNA within the nucleus is divided into chromosomes, 22 pairs of matched chromosomes and 2 sex chromosomes (X and Y chromosomes).Chromosomes in somatic cell - Correct Answers ✅46, are diploid- all chromosomes are paired
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