Bacteria
What are cells that do not have a nucleus or membrane-bound organelles?
Prokaryotes
What is a virus?
a strand of nucleic acid enclosed in a protein coat
True or False: Prions are able to move on their own?
False
When harmful bacteria, viruses, prions, or viroids infect another organism, what do they become?
Pathogens
A living thing that is smaller than can be seen by the human eye is called a ____________
Microorganism
What do biologists call archaebacteria that reside in places with a high salt concentration?
Halophiles
What does a virus need to reproduce?
A host
What are prions?
Prions are a type of protein that have no genetic material.
What do you call the conditions within an organism that prevent it from functioning normally?
Disease
What type of archaebacteria live in the hottest places?
Thernophiles
Who discovered bacteria in the late 1600s?
Antonie van Leeuwenhoek
What is an infectious agent that lives within an organism of another species?
Parasite
Are viroids smaller or bigger than viruses?
They are smaller than viruses
What is the responsibility of the immune system?
It is responsible for protecting the body from foreign substances and diseases
A ________ is any organism that can cause disease.
pathogen
Archaebacteria that give off methane as they produce their energy are called _____________.
Methanogens
What is a receptor?
Any protein that responds to another molecule binding to it.
What are viroids made of?
a single RNA molecule with no proteins
The removal of harmful bacteria from the skin is called _________________.
Disinfection
______ : to invade an organism.
Infect
What is a type of medicine that kills bacteria?
Antibiotic
What is the 3-letter abbreviation for Deoxyribonucleic Acid?
DNA
What year were the first viroids discovered?
1971
What process kills or removes all microorganisms from a surface?
Sterilization
What is the protective layer of a virus?
Envelope