Microbiology: Human Exposure to Microbes
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Questions and Answers

What is the primary site of permanent microbe residence in the human body?

  • Kidneys
  • Brain
  • Skin (correct)
  • Liver
  • What is an example of how postnatal exposure to different sources of flora can influence health and development?

  • Caesarean section instead of normal birth (correct)
  • Prolonged exposure to sunlight
  • Consuming probiotics
  • Regular exercise
  • What is an example of a systemic body function that is influenced by gut microbe-mediated developmental outcomes?

  • Spleen development (correct)
  • Pancreas function
  • Heart rate regulation
  • Lung function
  • What is the term for an interaction where one organism is inhibited and the other is not affected?

    <p>Amensal</p> Signup and view all the answers

    Why do germ-free mice models have defective spleen cells?

    <p>Due to lack of gut microbiota</p> Signup and view all the answers

    What is the term for an interaction where both organisms benefit?

    <p>Mutualist</p> Signup and view all the answers

    What is the primary characteristic of a parasitic relationship?

    <p>One side benefits at the other’s expense</p> Signup and view all the answers

    What is the estimated number of bacteria in the human colon?

    <p>10^11 to 10^12</p> Signup and view all the answers

    What is the primary function of bacteroides and firmicutes in the gut?

    <p>Consuming polysaccharides and performing fermentative metabolism</p> Signup and view all the answers

    What is the consequence of a lack of gut microflora on the enteric nervous system?

    <p>Underdeveloped enteric nervous system</p> Signup and view all the answers

    What percentage of microbial cells in the human body are bacteria?

    <p>98%</p> Signup and view all the answers

    What is the term for the relationship between two organisms where one benefits and the other is not affected?

    <p>Commensalism</p> Signup and view all the answers

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