Bacteria Are Single-Celled Organisms Without Nuclei
Which organisms have the smallest cells?
Bacteria
How do scientists usually group archaea?
According to where they live
How are viruses similar to living things?
Viruses can reproduce
Which type of virus might cause the most damage to a living organism?
A virus that destroys its host cell
They lack a true nucleus
Which of the following types of an organism is most likely to be found in a hot geyser?
Thermophiles - extreme heat or cold
Methanogens - dense mud of swamps and marshes, guts of animals such as cows and termites
Halophiles - salty lakes and ponds
True or False: Viruses can reproduce by themselves
False: viruses can't reproduce by themselves
Which is NOT mentioned as an illness that is caused by viruses?
MERS
(mentioned: smallpox, influenza, AIDS)
What part of the bacterium protects it from its surroundings?
The cell wall
What do many cities use bacteria for?
To break down sewage, clean ocean surface
Which two things do all viruses consist of?
A capsid and genetic material
During the influenza outbreak that followed WWI, why were infected patients isolated from the rest of the community?
Infected patients had to be isolated to prevent the disease from spreading
Which formations do spiral-shaped bacteria occur?
spiral-shaped: single strands
round-shaped: singly/pairs, chains/clusters
rod-shaped: singly/chains
Cows and termites
What is a bacteriophage?
A virus that infects bacteria
Which of the following is capable of being infected by viruses?
All living organims
What shaped bacteria that can occur singly, in pairs, chains, or clusters?
Round-shaped
How do bacteria cause the symptoms of disease?
-They can invade parts of the body, multiplying in body tissues and dissolving cells
-They can poison the body with chemicals they produce and release
-They can poison the body with chemicals that are part of bacteria themselves
Which step of the virus reproduction process comes directly after a bacteriophage attaches itself to a host cell?
The injection of the virus' DNA into the host cell
Attachment->Injection->Production->Assembly->Release
Which is mentioned as a way that some scientists today are using viruses in a positive way?
Some scientists are using viruses to insert certain pieces of genetic material into living cells