Chapter 1-Pathogens as Parasites Flashcards
(34 cards)
What is a parasitic relationship?
Pathogen and a host
What are viruses?
The genetic material in a capsid
What don’t prokaryotes have?
A distinct nucleus
What form is the genetic material in a prokaryote in?
DNA in the form of a single chromosome
Can transcription and translation be done simultaneously in a prokaryote?
YES!
Where is the genetic material in a eukaryote?
In the nucleus in several chromosomes
Do transcription and translation happen at the same time in a eukaryote?
NO!
Do prokaryotes have a cell membrane?
NO
Do prokaryotes have a cell wall?
YES
What is the outer layer of gram negative bacteria?
lipopolysaccharide layer
What is the outer layer of gram positive bacteria?
peptidoglycan
What is the function of cell walls for eukaryotic cells?
Protect against host immune system
What is a microparasite?
Viruses, bacteria, protozoa, and fungus
How do microparasites replicate?
Within the host. They can multiply and infect at an overwhelming rate
What is a macroparasite?
Worms and arthropods
How do macroparasites replicate and what does it depend on?
They do not replicate in the host. Their rate of infection depends on the number of organisms in the body.
What do pathogens require from the host?
A supply of metabolic materials
Where must viruses live?
Within the host cell
Where do intracellular microparasites (minus viruses) get their metabolic requirements from?
Directly from the cell
Where do extacellular organisms get their nutrients from?
From tissue fluids or by feeding directly on the host
Are pathogens protected within cells from the host’s defense mechanisms?
Yes!
Where can some pathogens live?
In the cells responsible for the hosts immune system
What does intracellular life help the pathogen with?
Supply to the host’s nutrient supply and escape from the host’s detection and defenses.
Can an organism be intracellular at all time?
NO
