Question

1.A biofilm of Staphylococcus aureus is growing on the inside of an intravascular catheter inserted into a patient's arm. The doctor recommends removing it and replacing it with a new one. Why? Group of answer choices

The microbes in the biofilm are antibiotic resistant and would be tough to eliminate

The bacteria are producing toxins that degrade the catheter

The bacteria can be transferred to a new patient when the catheter is removed

The catheter forms a parasitic relationship with the bacteria

The bacteria can be used to generate a vaccine to save the patient

2. Which of the following combinations of microbes is most likely to occur in the mouth?Group of answer choices

Enterobacter, Helicobacter, Ruminococcus, Proteus

Xanthomonas, Rhizobium, Sphinobacterium

Proprionibacterium, Prevotella, Staphylococcus, Burkholderia

Streptococcus, Fusobacterium, Porphyromonas, Corynebacterium

Bacillus, Chlamydomonas, Caldocellulosiruptor, Agrobacterium

Answer 1

These bacteria Staphylococcus aurei are generated toxins that degrade the catheter. Staphylococcus aurei are spread by direct contact. They can also spread through contaminated substances and can enter the bloodstream. They are gram-positive bacteria that cause skin infection and might also affect some organs in case of severe infection.

The microbes that are most likely to occur in the mouth are Streptococcus and Porphyromonas. The bacteria help in plaque or biofilm formation which results from the breakdown of carbohydrates. The layer of sucrose left on the teeth breaks down to glucose and fructose. Glucose is broken down to dextrin by bacteria while fructose is anaerobically broken down to lactic acid. Lactic acid erodes the enamel of the teeth causing cavities. If plaque accumulates in between teeth or surrounding gums it causes swelling that causes gingivitis.