Module 1 Quiz Flashcards
The gram stain is useful for what?
- Identification of bacteria
- Selection of antibiotics
- Selection of disinfectants
Staphylococci are average sized bacteria that measure one micrometer in diameter. How many of these bacteria could be lined up side by side along a straight line measure one millimeter?
1000
Bacteria that are described as grams positive are what?
Appear bluish black after being stained with the gram stain
What following agent may inhibit viral replication?
Acyclovir
Formation of bacterial endoscopes occur when what?
Growth conditions are adverse: to cold, too hot, too dry
What is the order of sizing from smallest to largest for microorganisms?
- Viruses
- Bacteria
- Fungi
- Protozoa
The three shapes of bacteria are what?
- Cocci
- Bacilli (Rods)
- Spirals
People suffering from common colds should do what?
Not take antibiotics
The process by which bacteria reproduce is what?
Binary fission
The growth phase in which the number of new cells equals the number of dying cells is what?
Stationary phase
During the stage of an infection between contact and appearance of symptoms (incubation), microbes are in the following phase?
lag
All viruses replicate how?
Inside living host cells
The growth phase where all bacteria are multiplying at maximum rate is what?
Log
Which of the following objects would be considered microscopic
1 micrometer
The unit used to measure the size of microoganisms is what?
Micrometers
Destruction of bacterial endoscopes are what?
- Difficult
- Requires high temperatures (121 degrees C) for destruction
- Requires the use of high level disinfectant
If a patient had gram negative bacilli in their CSF, it would mean that they had to possible infection with what?
Bacteria
An enveloped virus has what?
An outer lipid coat
Viral replication requires what?
Initial attachment to complementary sites on a host cell
A colony of bacteria results in what?
The multiplication of one bacterium
Which of the following belongs to the group Protozoa?
- Candida
- Streptococcus
- Adenovirus
- Giardia
Giardia
The phases of the growth curve listed in order are what?
Lag, log, stationary, death(decline)
Infections caused by staphylococcus tend to develop quickly whereas tuberculosis is slowly developing disease that may take weeks to produce disease symptoms. What would this tell us about the generation times of these two bacteria? Which bacteria would form colonies the fastest on culture media?
Staphylococcus has a short generation time and would grow overnight on culture media
Rapidly growing bacteria have a generation time of approximately what?
15- 30 minutes
Early microbiologist attempted to disprove the theory of spontaneous generation by boiling hay to kill microbes and culturing the heated infusion. Bacteria always grew from the “sterilized” infusion lending support to the concept of spontaneous generation. How could bacteria grow from this heated and cooled infusion?
- Heat resistant bacterial spores are found in hay and soil. Spores could become vegetative and grow in the infusion
- Boiling generally will not kill spores (therefore the infusion was not sterilized)
The phase in which the patient is recovering is what?
Death (decline)
Some bacteria are able to survive for long periods of time in dry conditions because they?
Can produce endoscopes
