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Prokaryote Lineages exam Flashcards

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Prokaryote Lineages exam
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  • Proteobacteria


    A diverse clade of gram-negative bacteria organized into subgroups named with Greek letters.

  • What is the significance of proteobacteria in eukaryotes?


    Proteobacteria were engulfed by a cell and eventually became mitochondria.

  • Chlamydia


    A group of gram-negative bacteria that lack peptidoglycan and are all parasites.

  • What diseases are caused by spirochetes?


    Lyme disease and syphilis.

  • Spirochetes


    Gram-negative heterotrophs with a distinct corkscrew shape.

  • What is the role of cyanobacteria in the atmosphere?


    Cyanobacteria are responsible for the origin of oxygen in the atmosphere.

  • Cyanobacteria


    Gram-negative photoautotrophs that perform oxygenic photosynthesis.

  • What are stromatolites?


    Calcium carbonate structures exuded by cyanobacteria, representing the oldest fossils of life on Earth.

  • Actinobacteria


    High GC gram-positive bacteria, including the genus Streptomyces, which produces many antibiotics.

  • What is the significance of the genus Streptomyces?


    It is responsible for producing many antibiotics.

  • Firmicutes


    Low GC gram-positive bacteria, including the genus Lactobacillus, important for yogurt and gut health.

  • What is the role of Lactobacillus in humans?


    Lactobacillus species help with digestion and maintain the vaginal environment.

  • What is the common misclassification of actinobacteria?


    They were initially misclassified as fungi due to their fungus-like morphology.

  • What is the ecological significance of cyanobacteria?


    They are crucial for oxygen production and are the oldest known fossils.

  • What is the main characteristic of chlamydia's cell wall?


    Chlamydia lack peptidoglycan in their cell walls.

  • What are the subgroups of proteobacteria?


    Alpha, beta, gamma, delta, epsilon, and zeta.

  • What is the shape of spirochetes?


    Corkscrew shape.

  • What is the GC content in actinobacteria?


    High percentage of guanine and cytosine in their DNA.

  • What is the role of firmicutes in food production?


    They are vital for yogurt, cheese, and sour beer production.

  • What is the relationship between proteobacteria and nitrogen fixation?


    Many species of proteobacteria are involved in nitrogen fixation.

  • What is the common name for cyanobacteria?


    Blue-green algae, although they are prokaryotes.

  • What is the medical significance of chlamydia?


    It includes species that cause the STD chlamydia.

  • What is the significance of firmicutes in human health?


    They help with digestion and maintain gut health.

  • What is the main feature of actinobacteria's morphology?


    Chains of cells form branching mycelia.

  • What is the significance of cyanobacteria in fossil records?


    They form stromatolites, the oldest known fossils of life on Earth.

  • What is the role of proteobacteria in the evolution of eukaryotic cells?


    They gave rise to mitochondria.

  • What is the main characteristic of firmicutes' DNA?


    Low GC content.