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Questions and Answers
What occurs during the sexual reproduction phase of Dictyostelium?
What occurs during the sexual reproduction phase of Dictyostelium?
What is the outcome of the repeated mitotic divisions of the diploid zygote's nucleus?
What is the outcome of the repeated mitotic divisions of the diploid zygote's nucleus?
What initiates the formation of a haploid slug-like aggregate in Dictyostelium?
What initiates the formation of a haploid slug-like aggregate in Dictyostelium?
What is the primary role of solitary haploid amoebas during the feeding stage?
What is the primary role of solitary haploid amoebas during the feeding stage?
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What happens to the giant cell after it develops a resistant wall?
What happens to the giant cell after it develops a resistant wall?
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What is the first step in the life cycle of Plasmodium after a mosquito bite?
What is the first step in the life cycle of Plasmodium after a mosquito bite?
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What occurs to merozoites after they enter red blood cells?
What occurs to merozoites after they enter red blood cells?
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Which cells form when merozoites develop into a different stage in the life cycle of Plasmodium?
Which cells form when merozoites develop into a different stage in the life cycle of Plasmodium?
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Where does fertilization of gametes occur in the life cycle of Plasmodium?
Where does fertilization of gametes occur in the life cycle of Plasmodium?
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What is produced when the sporangium of a plasmodial slime mold undergoes meiosis?
What is produced when the sporangium of a plasmodial slime mold undergoes meiosis?
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What structure develops from the diploid zygote in the mosquito's gut?
What structure develops from the diploid zygote in the mosquito's gut?
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What happens to the spores inside the sporangium of the slime mold?
What happens to the spores inside the sporangium of the slime mold?
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What best describes the feeding stage of the plasmodial slime mold?
What best describes the feeding stage of the plasmodial slime mold?
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Study Notes
Protists: Life Cycles
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Plasmodium (Malaria): A two-host life cycle involving mosquitos and humans.
- Mosquito stage: Plasmodium sporozoites are injected into the human host through mosquito saliva.
- Human stage: Sporozoites infect liver cells, then red blood cells. Repeated cycles of asexual reproduction (merozoites) lead to recurring chills and fever. Some merozoites evolve into gametocytes.
- Back to mosquito: Infected human blood containing gametocytes is sucked up by the mosquito. Fertilization occurs in the mosquito's gut, creating zygotes.
- Oocysts and sporozoites: Zygotes form oocysts, which produce thousands of new sporozoites in the mosquito's salivary glands. This cycle repeats.
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Plasmodial Slime Mold: A unique life cycle involving a feeding stage called plasmodium.
- Feeding stage: Amoeboid cells form a multinucleated plasmodium and feed.
- Fruiting stage: The plasmodium develops into a stalk-like fruiting structure (sporangium) with spores.
- Spore release: Spores are released and germinate, creating new amoeboid cells.
- Fertilization: Two haploid amoeboid or flagellated cells fuse to create a diploid zygote.
- Repeat: Repeated mitosis from a zygote creates the plasmodium.
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Cellular Slime Mold (Dictyostelium): Distinct life cycle involving both asexual and sexual reproduction.
- Feeding stage: Solitary amoebae engulf bacteria using lobe-like extensions.
- Sexual or asexual reproduction: Haploid amoebae can reproduce asexually by cell division. Or they can fuse with other haploid amoebae to create a diploid zygote.
- Cellular aggregation: Many amoebae respond to chemical signals, aggregating into a slug-like aggregate.
- Sporangium formation: The slug migrates, a stalk forms, and eventually a fruiting body (sporangium) containing spores develops.
- Spore dispersal: Spores are released and germinate in favorable conditions, making new amoebas, and the cycle starts again.
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Description
Test your knowledge on the complex life cycles of protists, focusing on Plasmodium, the causative agent of malaria, and the fascinating life cycle of plasmodial slime molds. Explore their unique stages, hosts involved, and reproductive methods. This quiz is perfect for biology enthusiasts and students alike.
