Multiple Choice
Which of the following is primarily responsible for eventually stopping the spread of a virus within a host organism?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
Multiple Choice
Which of the following correctly ranks the size of viruses relative to bacteria, prions, and viroids, from largest to smallest?
A
Prions > Viroids > Viruses > Bacteria
B
Viruses > Bacteria > Prions > Viroids
C
Bacteria > Viruses > Viroids > Prions
D
Viroids > Prions > Bacteria > Viruses
Verified step by step guidance1
Step 1: Understand the size ranges of each entity. Bacteria are single-celled organisms typically ranging from about 0.5 to 5 micrometers (µm) in size.
Step 2: Viruses are smaller than bacteria, generally ranging from about 20 to 300 nanometers (nm), which is 0.02 to 0.3 micrometers.
Step 3: Viroids are even smaller than viruses; they are small infectious RNA molecules, usually about 250 to 400 nucleotides long, roughly a few nanometers in size.
Step 4: Prions are misfolded proteins and are the smallest infectious agents, smaller than viroids, typically on the order of a few nanometers or less.
Step 5: Based on these size ranges, rank them from largest to smallest as: Bacteria > Viruses > Viroids > Prions.
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