Use the terms species, culture, clone, and strain in one sentence to describe gr

Question

Use the terms species, culture, clone, and strain in one sentence to describe growing methicillin-resistant Staphylococcus aurous (MRSA). Why wouldn't the definition of a viral species work for a bacterial species? A patient with a heart pacemaker received antibiotic therapy for streptococcal bacteremia (bacteria in the blood). One month later, he was treated for recurrence of the bacteremia. When the returned six weeks later, again with bacteremia, the physician recommended replacing the pacemaker. Why did this cure his condition? Could humans/eukaryotic cells exist on chemically defined media, at least under laboratory conditions? Explain your answer. Give at least three reasons why a bacterial colony does not grow an infinite size, or at least fill the confines of the Petri plate. Why is it generally easier to determine the cause of pneumonia than it is to determine the cause of a wound infection (cutting yourself with a knife)? What is the difference between the term bacillus and Bacillus? How would you be able to identify streptococci through a microscope? Describe the structure and function of each of the following: glycocalyx, pilli, flagella, fimbriae, and axial filaments. Give one reason how each structure would give the microorganism a survival advantage against the human immune system and or against antibiotics. What determines the result of Gram Staining? Why is it important? Describe the bacterial cell wall from superficial to deep.

Explanation / Answer

64) structure and functions of The glycocalyx is a carbohydrate-enriched coating that covers the outside of many eukaryotic cells and prokaryotic cells, particularly bacteria . When on eukaryotic cells the glycocalyx can be a factor used for the recognition of the cell. On bacterial cells, the glycocalyx provides a protective coat from host factors.

Pilli:The first external structure is the pilus (plural: pili). A pilus is a thin, rigid fiber made of protein that protrudes from the cell surface. The primary function of pili are to attach a bacterial cell to specific surfaces or to other cells. . Pili can also aid in attachment between bacterial cells.

Flagella:A flagellum is a whip-like structure that allows a cell to move. ... Other cells have different means of locomotion. Cilia are similar to flagella in structure and function, but a cilium is shorter and moves differently. A ciliated cell usually has hundreds or thousands of cilia, which move in unison like little oars.

The fimbriae are connected to the ovary. Small epithelial cells — those that line cavities throughout the body — with small, slender cilia (microscopic, hair-likestructures) pulsate inside the fallopian tubes to guide the ovum, or egg, from the ovary to the uterus.

The central filament of a flagellum or cilium. Also called axoneme or Axial filament.

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