Leishmania parasites exist as extracellular promastigotes and intracellular amastigotes, making them what form?

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Study for the Introduction to Parasitology Test. Use flashcards and multiple-choice questions, each question offers hints and explanations. Prepare for your exam thoroughly!

Multiple Choice

Leishmania parasites exist as extracellular promastigotes and intracellular amastigotes, making them what form?

Explanation:
Leishmania exhibit two distinct forms depending on where they live, which is dimorphism. In the sandfly vector, they exist as promastigotes—elongated, flagellated, extracellular forms suited to movement in that insect. When transmitted to a mammalian host, they transform into amastigotes inside macrophages—intracellular, non‑motile forms that adapt to the intracellular environment. This switch between two forms is what's being highlighted. Monomorphic would mean only one form throughout, polyphenic isn’t the standard descriptor here, and amoeboid doesn’t fit since these forms are not characterized by amoeboid movement.

Leishmania exhibit two distinct forms depending on where they live, which is dimorphism. In the sandfly vector, they exist as promastigotes—elongated, flagellated, extracellular forms suited to movement in that insect. When transmitted to a mammalian host, they transform into amastigotes inside macrophages—intracellular, non‑motile forms that adapt to the intracellular environment. This switch between two forms is what's being highlighted. Monomorphic would mean only one form throughout, polyphenic isn’t the standard descriptor here, and amoeboid doesn’t fit since these forms are not characterized by amoeboid movement.

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