Prokaryotic Bacteria: Characteristics and Importance
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Questions and Answers

What is a key characteristic of bacteria in terms of their design?

  • They have organelles for better efficiency
  • They have a simple structure with no organelles (correct)
  • They have a complex internal structure
  • They are larger in size compared to eukaryotic cells

    • How long have bacteria survived as the only kinds of cells on Earth?

  • 5 billion years
  • 1 billion years
  • 500 million years
  • 2 billion years (correct)

    • What makes bacteria the most common organism on Earth?

  • Their multicellular nature
  • Their large size
  • Their high number of cells (correct)
  • Their ability to grow on artificial media

    • How many formally named 'species' of bacteria exist?

    <p>100,000</p> Signup and view all the answers

    Why is it challenging to study most bacteria?

    <p>They don't form isolated colonies</p> Signup and view all the answers

    In what way do microbial communities resemble multicellular organisms?

    <p>They take on some characteristics of multicellular organisms</p> Signup and view all the answers

    What is the main advantage of microbial communities for individual species?

    <p>Protection from predators</p> Signup and view all the answers

    What characterizes colonies of bacteria in nature?

    <p>Distinctive features such as color and smell are common</p> Signup and view all the answers

    What is the purpose of selective media in bacterial cultures?

    <p>Prevent the growth of certain bacteria</p> Signup and view all the answers

    What is a characteristic of bacterial blooms?

    <p>They result from rapid reproduction of bacteria</p> Signup and view all the answers

    Where do biofilms or microbial mats typically grow?

    <p>On rocks, streambeds, and soil crumbs</p> Signup and view all the answers

    What is the main function of a bacterial capsule?

    <p>Protect from drying out and phagocytosis</p> Signup and view all the answers

    What is the significance of stromatolites in the context of early Earth?

    <p>Produced most of the O2 in Earth's early atmosphere</p> Signup and view all the answers

    What differentiates bacterial cells from eukaryotic cells?

    <p><strong>Bacterial cells lack a nucleus</strong></p> Signup and view all the answers

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