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Microbiology: Prokaryotes and Bacterial Characteristics

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  • Common methods of reproduction in prokaryotes

    Binary fission is the primary method, where one cell divides into two identical cells. Other methods include budding and spore formation.

  • How prokaryote arrangements arise

    Arrangements result from the pattern of cell division and whether daughter cells remain attached, forming clusters like chains, pairs, or grape-like clusters.

  • Purpose of Bergey’s Manual of Systematic Bacteriology

    It is a comprehensive reference used to classify and identify bacteria based on genetic, biochemical, and morphological characteristics.

  • Difficulty in applying traditional taxonomy to microbes

    Microbes often lack distinct morphological features and have horizontal gene transfer, making classification by traditional methods challenging.

  • Features of archaea compared to bacteria and eukaryotes

    Archaea have unique membrane lipids, lack peptidoglycan in cell walls, and share some genetic similarities with eukaryotes, differing from bacteria.

  • Types of extremophiles and their survival conditions

    Extremophiles include thermophiles (heat), halophiles (salt), and acidophiles (acidic environments), adapted to survive extreme conditions.

  • Implications of lack of cell walls in mycoplasmas

    Without cell walls, mycoplasmas are resistant to antibiotics targeting cell wall synthesis and have flexible shapes.

  • Difference between low and high G + C content in bacteria

    Low G + C bacteria have fewer guanine and cytosine bases, often with faster growth, while high G + C bacteria have more stable DNA and diverse metabolic capabilities.

  • Importance of nitrogen-fixing alphaproteobacteria to crops and biofuels

    They convert atmospheric nitrogen into usable forms, enhancing soil fertility and supporting sustainable agriculture and biofuel production.

  • Significance of nitrification to other organisms

    Nitrification converts ammonia to nitrate, making nitrogen available to plants and maintaining ecosystem nitrogen balance.

  • Use of Agrobacterium in genetic modification of plants

    Agrobacterium transfers DNA into plant cells, enabling genetic engineering of adult plants for traits like pest resistance.

  • Differences between chlamydias and spirochetes

    Chlamydias are obligate intracellular parasites, while spirochetes are spiral-shaped bacteria with unique motility mechanisms.

  • Ecological significance of bacteroids

    Bacteroids are nitrogen-fixing forms of rhizobia inside legume root nodules, crucial for plant nitrogen supply.

  • Role of temperature in bacterial survival and growth

    Temperature affects enzyme activity and membrane fluidity, determining bacterial growth rates and survival ranges.

  • How UV light affects bacterial growth

    UV light damages bacterial DNA, inhibiting replication and can be used to slow or eliminate bacterial growth.