29 Questions
Which of the following is a type of infectious agent that lacks a cellular structure?
prions
What is the purpose of using viruses to produce vaccines?
To prevent certain viral infections
What is the size range of viruses?
2 nm to 450 nm
What is the term used to describe a fully formed virus that can cause an infection in a host cell?
Virion
Which of the following is not a major element of a microbial cell?
Copper
Which term refers to an organism that uses organic compounds as its carbon source?
Saprobe
Who developed a rabies vaccine by separating bacteria from virus using a filter?
Pasteur
Which of the following can host viruses?
humans and other animals
Which term is used to describe the shape of a virus capsid?
core
What does a naked virus lack?
envelope
What does reverse transcriptase synthesize?
DNA from RNA
What does the term facultative refer to?
Existing in a very narrow niche
What is the term for the diffusion of water through a semipermeable membrane?
Endocytosis
What would happen to bacteria living in a freshwater stream if moved to salty seawater?
Shrivel
What is the specific term for the process where whole cells or large molecules are engulfed by a cell?
Facilitated transport
Which group do human pathogens fall into?
Mesophiles
A microorganism lacking catalase or superoxide dismutase would struggle to live in an environment with?
High oxygen concentration
Which of the following factors would inhibit the growth of an obligate aerobe?
carbon dioxide
Which type of organism can switch between aerobic and anaerobic respiration pathways?
Facultative anaerobe
An organism that cannot tolerate any oxygen in its environment is classified as a(n):
Obligate anaerobe
Which environment would be most suitable for the growth of a halophile?
Salt lakes
During which phase of the bacterial growth curve do cell division and cell death rates become equal?
Stationary phase
In the viable plate count method, what does each colony represent?
A single colony from the sample
What determines the host range and tissue specificity of a virus?
The type of host cell receptors on the cell membrane
What term describes the ability of a virus to cause tumors in mammals?
Oncovirus
Which of the following best describes a virus that can remain dormant but periodically reactivate?
Chronic latent virus
What is the term for the process where a viral genome inserts itself into a bacterial host chromosome?
Lysogeny
What term is used to specifically refer to viruses that infect bacteria?
Phages
Which of the following are infectious protein particles?
Prions
Test your knowledge on viral characteristics such as type of nucleic acid, age of host cell, host cell receptors, and viral tissue specificities. Identify mammalian viruses capable of causing tumors and persistent viruses that can reactivate periodically.
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