16 Questions
What is the estimated ratio of microbial cells to human cells on the planet?
9 microbial cells for each human cell
Where are most common locations for microbes in the human body found?
Nasal, oral cavity, GI tract, Urogenital tract, and the skin (armpit and forearm)
Which of the following statements describes the relationship between microbial cells and human cells?
9 microbial cells for each human cell
What is the significance of the number of genes associated with the human microbiome compared to the number of human genes?
More genes associated with the human microbiome than the number of human genes (100 to 1)
What is the composition of the bacterial flagella?
Flagellin protein
How do antibacterials like streptomycin and tetracycline inhibit protein synthesis?
By interfering with ribosomal subunits
In terms of location, what does 'peritrichous' mean in relation to flagella?
All over the cell
What is the function of the basal body of flagella in bacteria?
Anchors the flagella and spans through the entire cell wall
What is virulence?
The quantitative measure of pathogenicity and measured by the number of organisms required to cause a disease
Which virulence factor is essential for the colonization of the host and increases the ability to adhere to the surface of human cells?
Adhesins (fimbriae or pili)
What is the function of capsules as a virulence factor?
To prevent phagocytosis and binding of phagocytes
What type of toxin is released by Gram-negative cells when they die?
Endotoxins
Which type of microorganism has no means of independent life-support and is usually just protein and one type of nucleic acid?
Bacteria
What is the main difference between yeast and molds?
Yeast are unicellular and molds are multicellular
What is the main component of the cell wall in bacteria?
Peptidoglycans
Which microorganism has a huge difference in size compared to animal cells, with a typical size of 0.5 to 5 um?
Bacteria
Test your knowledge of basic microbiology concepts related to viruses, bacteria, and fungi with this quiz. Questions cover characteristics and properties of these microorganisms, including their structures, functions, and classifications.
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