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Questions and Answers
What method is used to identify a toxicant through body fluids or excrement?
What method is used to identify a toxicant through body fluids or excrement?
Which of the following is NOT a typical method for toxicant identification?
Which of the following is NOT a typical method for toxicant identification?
Which process would involve examining DNA in relation to toxicant identification?
Which process would involve examining DNA in relation to toxicant identification?
What is the main goal of chemically treating samples in toxicology?
What is the main goal of chemically treating samples in toxicology?
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What type of analysis can be performed to identify toxicants using liquid samples?
What type of analysis can be performed to identify toxicants using liquid samples?
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What is defined as anything that can produce an adverse biological effect?
What is defined as anything that can produce an adverse biological effect?
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Which of the following is NOT a form that an adverse biological effect can take?
Which of the following is NOT a form that an adverse biological effect can take?
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Which type of test is included in presumptive laboratory tests?
Which type of test is included in presumptive laboratory tests?
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Which of these is an example of a chemical that can produce an adverse biological effect?
Which of these is an example of a chemical that can produce an adverse biological effect?
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What is one of the methods mentioned for presumptive testing?
What is one of the methods mentioned for presumptive testing?
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What type of adverse biological effect is radiation classified under?
What type of adverse biological effect is radiation classified under?
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Which of the following is NOT a presumptive test mentioned?
Which of the following is NOT a presumptive test mentioned?
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Which of the following is an example of a biological agent causing adverse effects?
Which of the following is an example of a biological agent causing adverse effects?
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What is the primary purpose of presumptive laboratory tests?
What is the primary purpose of presumptive laboratory tests?
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Which statement is true regarding the tests mentioned?
Which statement is true regarding the tests mentioned?
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What is characterized by long periods of time, such as weeks, months, or years?
What is characterized by long periods of time, such as weeks, months, or years?
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Which type of exposure is considered short-term?
Which type of exposure is considered short-term?
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Which of the following best describes chronic exposure?
Which of the following best describes chronic exposure?
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Acute exposure is to be understood as:
Acute exposure is to be understood as:
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Which option does NOT represent a type of exposure related to time duration?
Which option does NOT represent a type of exposure related to time duration?
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What instruments are mentioned for identifying components in toxicology?
What instruments are mentioned for identifying components in toxicology?
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Which of the following is NOT a function of mass spectrometers?
Which of the following is NOT a function of mass spectrometers?
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What type of spectrometer is used alongside mass spectrometers for identification?
What type of spectrometer is used alongside mass spectrometers for identification?
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In toxicology, what role do spectrometers play in analyzing samples?
In toxicology, what role do spectrometers play in analyzing samples?
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Why is the identification of components important in toxicology?
Why is the identification of components important in toxicology?
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Microcrystalline tests are a special class of presumptive drug analyses that produce what type of products?
Microcrystalline tests are a special class of presumptive drug analyses that produce what type of products?
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Which type of drug analysis do microcrystalline tests belong to?
Which type of drug analysis do microcrystalline tests belong to?
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What is a key characteristic of the products produced by microcrystalline tests?
What is a key characteristic of the products produced by microcrystalline tests?
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Which of the following best describes the nature of microcrystalline tests?
Which of the following best describes the nature of microcrystalline tests?
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Microcrystalline tests are primarily used for which purpose in drug analysis?
Microcrystalline tests are primarily used for which purpose in drug analysis?
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Study Notes
Hair Morphology
- The basic components of hair are keratin (a strong protein resistant to decay) and melanin (a pigment).
- Keratin forms stable fibrils.
Hair Layers
- Hair has three layers: cuticle, cortex, and medulla.
- The outer layer is the cuticle.
- The cortex is the middle layer.
- The inner layer is the medulla.
Hair Collection Evidence
- Hair and fiber evidence is collected from carpets, bedding, etc.
- It should be packaged in paper packets.
- Methods for collection include using hands, powder, hairbrushes, and filtered vacuum cleaners.
- Other tools may include tweezers and scissors, sticky tape, and lint rollers.
Hair Identification and Comparison
- Properties like length, color, diameter, presence/absence of medulla, distribution, shape and pigment intensity in the cortex, and whether the hair is dyed, bleached or natural are considered in hair identification and comparison.
- Forensic scientists can determine species, race, and origin of a hair.
- This is done through microscopic examination and tests including DNA analysis.
Microscopic Hair Examination
- Microscopic examination of hair can determine if the hair is from an animal or human.
Presumptive and Confirmatory Tests
- Presumptive tests indicate the possibility of an illegal substance.
- Confirmatory tests provide a positive identification of the substance.
- Presumptive tests include color tests, microcrystalline tests, UV, IR, TLC, and microscopic examination.
- Confirmatory tests separate and identify components using techniques like gas chromatography, capillary electrophoresis, wet chemistry, alongside instruments like mass spectrometers (MS) or infrared spectrometers (IR).
- Techniques like chromatography can be used with other techniques, such as UV and infrared spectroscopy, during confirmatory analysis.
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Description
This quiz covers the essential aspects of hair morphology, including the basic components and layers of hair. It also emphasizes methods for collecting hair evidence and the identification techniques used in forensic science. Test your knowledge on the characteristics and collection of hair in criminal investigations.
