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Chapter 26. Toxic Effects of Plants and Animals

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All of the following statements regarding plant toxicity are true EXCEPT:

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a. Genetic variability plays a role in the toxicity of a plant.

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b. Plant toxins are most highly concentrated in the leaves.

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c. Young plants may have a higher toxin concentration than older plants.

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d. The weather can influence the toxicity of plants.

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e. Soil composition can alter a plant’s production of toxin.

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Contact with which of the following plant species would be LEAST likely to cause an allergic dermatitis?

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a. Urtica.

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b. Philodendron.

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c. Rhus.

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d. Dendranthema.

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e. Hevea.

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Which of the following statements regarding lectin toxicity is FALSE?

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a. Lectins have an affinity for N-acetylglucosamine on mammalian neurons.

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b. Consumption of lectins can cause severe gastrointestinal disturbances.

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c. The fatality rate after ingestion of a fatal dose is very high.

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d. Some toxic lectins inhibit protein synthesis.

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e. A diet high in some lectins has been linked to reduced weight gain.

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Colchicine, found in lily bulbs:

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a. causes severe dehydration.

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b. is sometimes used as a purgative.

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c. causes a severe contact dermatitis.

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d. inhibits sphingolipid synthesis.

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e. blocks microtubule formation.

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Activation of a vanilloid receptor is characteristic of which of the following chemicals?

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a. acetylandromedol.

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b. capsaicin.

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c. colchicine.

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d. ergotamine.

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e. linamarin.

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Which of the following plant species is known to cause cardiac arrhythmias on ingestion?

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a. Dieffenbachia.

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b. Phytolacca americana.

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c. Digitalis purpurea.

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d. Pteridium aquilinum.

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e. Cicuta maculate.

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Which of the following plant toxins does NOT affect the neuromuscular junction?

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