Question

In: Biology

Please list the term that matches the description. 1. Staphylococcus aureus secretes this protein which punches...

Please list the term that matches the description.

1. Staphylococcus aureus secretes this protein which punches holes in red blood cells. _______

2. Means “Living together”. _______

3. Degree of pathogenicity. _______

4. Hospital acquired infections that arise from a patient’s normal microbes in a health care setting.  _______

5. Lipopolysaccharide of Gram negative bacteria. _______

6. When both symbionts benefit from their interaction. _______

7. A second stage of infection disease, which is short with generalized mild symptoms. _______

8. Formerly called nosocomial infections. _______

9. Another word for disease. _______

10. A symbiont that benefits without significantly affecting the other. _______

Solutions

Expert Solution

1. Hemolysin

Bacteria producing haemolysin (like Staphylococcus), can cause partial or complete lysis of RBC. Different types of haemolysis are:

  • Alpha haemolysis: greenish- discoloration around the colony. Partial Haemolysis.
  • Beta Haemolysis: Complete haemolysis. Zone of clearing around colonies.
  • Gamma haemolysis: no haemolysis observed. Colonies may appear on media.

2. Symbiosis

  • The word “Symbiotic” in Greek, means living together.
  • It involves interaction like mutualism, commensalism or antagonism (parasitic) relationship between two unrelated organisms.

3. Virulence

  • The capacity of a pathogenic organism to cause disease is called as the pathogenicity.
  • The gegree of pathogenicity is the virulence for the organisms. It is related to virulence factors possessed by the organism

4. Nosocomial

  • In immunocompromised people, severe infection may result, mostly in form of nosocomial infections (hospital related).

5. Endotoxin (LPS)

  • LPS or lipopolysachharide layer is present in outer membrane of Gram negative bacteria.
  • The comprise of the O-antigen or endotoxin.
  • They are integral part of the bacteria.
  • They can be released only when the bacteria die. Example E. coli, Salmonella typhi.

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