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Final Evaluation

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    309305
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    1. General rule of thumb for apoptosis is that it is more commonly seen at higher levels of toxicant exposure while necrosis occurs more frequently at relatively lower levels of toxicant exposure. True or False?

    True

    False

    Answer

    False

    2. Neoantigen formation results when a xenobiotic or its metabolite binds to a larger protein to form a novel molecule that elicits an immune response. Molecules that trigger this immune response are called:

    Haptens

    Free radicals

    Electrophils

    Poisons

    Answer

    Haptens

    3. Lipid peroxidation occurs when an _______ compound steals an electron from a membrane phospholipids resulting in the production of a fatty acid radical.

    Electrophobic

    Hydroxyl radical

    Electrophilic

    Hydrophilic

    Answer

    Electrophilic

    4. Electron transfer can result in oxidation of some endogenous macromolecules and formation of _________ such as superoxide ion (•O2-) and hydroxyl radical (HO•).

    Enzymes

    Hormones

    Free radicals

    Proteins

    Answer

    Free radicals

    5. Upon exposure of human skin with leaves of poison ivy, the toxin found in this plant binds to membranes on skin cells to stimulate an immune response resulting in blistering rash. This toxin is known as:

    Urushiol

    Ricin

    Tetrodotoxin

    Pyrethrins

    Answer

    Urushiol

    6. Which of the following covalently binds to the acetaminophen metabolite N-Acetyl-P-Benzoquinone Imine (NAPQI) to detoxify it?

    N-acetylcysteine

    Superoxide dismutase

    Catalase

    Amylase

    Answer

    N-acetylcysteine

    7. Differences between Necrosis and Apoptosis include the following EXCEPT:

    Necrosis is a degenerative process while Apoptosis is an active process

    Necrosis triggers inflammatory response while Apoptosis does not incite inflammatory response

    Necrosis results in loss of energy while Apoptosis does not result in loss of energy

    Necrosis is an active process while Apoptosis is a degenerative process

    Answer

    Necrosis is an active process while Apoptosis is a degenerative process

    8. A regenerative response that results in an increase in cell size is termed ______.

    Hypertrophy

    Hypoplasia

    Hyperplasia

    Atrophy

    Answer

    Hypertrophy

    9. ______ helps to terminate lipid peroxidation when present in sufficient quantities.

    Vitamin E

    Hydroxyl radical

    Vitamin A

    Oxygen

    Answer

    Vitamin E

    10. An “adduct” is the product of an irreversible bond between the toxicant and target molecule; this type of binding is known as:

    Noncovalent binding

    Covalent binding

    Hydrogen abstraction

    Ionic binding

    Answer

    Covalent binding

    11. An example of decreasing the reactivity of a target site to a toxicant is describe as:

    Binding of toxicant to target receptors

    Downregulation of toxicant target receptors

    Increased metabolism of alcohol within the stomach and liver

    Stimulation of membrane receptors

    Answer

    Downregulation of toxicant target receptors

    12. 10% of acetaminophen bioactivated by Cytochrome P450 in the liver to a toxic metabolite is called:

    Superoxide dismutase

    N-acetylcysteine

    N-acetyl-P-Benzoquinone Imine (NAPQ1)

    Superoxide ion

    Answer

    N-acetyl-P-Benzoquinone Imine (NAPQ1)


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