Chapter 9 & 10 Flashcards
(124 cards)
Living organisms that are too small to be seen with the naked eye
Microorganisms
Examples of microorganisms
bacteria, viruses, fungi, prions and protozoa
Microorganisms that live on or inside the body without causing infections or diseases are referred to as
Normal flora
They aid in skin preservation and digestion and protect us from harmful organisms that can cause infections or diseases
Normal flora
Microorganisms that cause infections and diseases are called
Pathogens
Very small, single-celled organisms with a cell wall and an atypical nucleus that lacks a membrane
Bacteria
a resistant form of the bacterium that is produced within the cell when environmental conditions are unfavorable
Endospores
Can grow independently and replicate without a host cell
Bacteria
Subcellular organisms and are among the smallest known disease-causing organisms. Because of their small size, they must be viewed with an electron microscope
Viruses
A fully developed viral particle
Virion
Needs a host and can mutate quite rapidly, becoming resistant to drugs that were originally effective against them.
Virus
occur as single-celled yeasts or as long, branched, filament-like structures called molds that are composed of many cells
Fungi
It has been difficult to create antiviral drugs that are not also harmful to the host cell. Only a few antiviral agents exist, and these are useful against only a limited number
Viruses
fungi cause skin infections
athlete’s foot, ringworm
Infections caused by usually nonpathogenic organisms
Opportunistic infections
The smallest and least understood of all pathogens
Prion
Do not have DNA or RNA
Prions
Are complex single-celled animals that generally exist as free-living organisms
Protozoa
What is the correct order for the Cycle of Infection
Pathogenic organisms, reservoir of infection, portal of exit, means of transmission, portal of entry, susceptible host
made up of genetic material, either DNA or RNA which is protected by an outer protein coating called capsid.
Virion
how do molds reproduce?
molds reproduce by spore formation
example of prions
mad cow disease
how protozoa classified as:
motile or nonmotile
distinguish pathogens from nonpathogenic organisms and normal flora
Virulence factors