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 (A)</p> Signup and view all the answers

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

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

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

<p>Mutualist (C)</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 (C)</p> Signup and view all the answers

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

<p>10^11 to 10^12 (A)</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 (B)</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 (C)</p> Signup and view all the answers

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

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

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