Chapter 2: Medically Important Bacteria (1) Flashcards
Do gram + or gram - bacteria have an outer membrane?
gram (-) –> it is the LPS
Who has a thicker cell wall?
gram (+)
What composes the cell well of bacteria?
peptidoglycan
What abx target the cell wall?
Penicillins and cephalosporins
What is found in the cell wall of gram (+) bacteria?
teichoic acids
Do gram (+) or gram (-) bacteria have periplasmic space?
Gram (-)
Do gram (+) or gram (-) have a pilus/ fimbria?
gram (-)
What type of bacteria have flagellum?
Gram (+) and Gram (-)
What type of bacteria have axial filiments for motility?
spirochetes, gram (-)
What are the phases of the exponential growth chart of bacteria?
Lag–> log–> stationary–> death
What happens in the lag phase?
Initial phase where the medium is detoxified and enzymes are turned on
What occurs in the log phase?
rapid exponential growth
What happens in the nutrient phase?
nutrients are used up and toxic products accumulate
Number of dying cells= number of new cells
What phase are antibiotics most useful in?
Log phase
What type of organisms grow on Thioglycolate medium?
anaerobes
