Multiple Choice
Which viral disease is actually a group of many similar viral infections caused by different but related viruses?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
Multiple Choice
Which of the following viral types enter animal cells via fusion with the animal cell membrane?
A
Prions
B
Enveloped viruses
C
Viroids
D
Non-enveloped viruses
Verified step by step guidance1
Understand the structure of the different viral types listed: prions, viroids, enveloped viruses, and non-enveloped viruses. Prions and viroids are not viruses but infectious agents without typical viral structures.
Recall that enveloped viruses have a lipid bilayer membrane derived from the host cell, which allows them to fuse directly with the animal cell membrane during entry.
Recognize that non-enveloped viruses lack this lipid envelope and typically enter cells via endocytosis rather than membrane fusion.
Identify that prions are misfolded proteins and viroids are small RNA molecules, neither of which enter cells by membrane fusion.
Conclude that only enveloped viruses use fusion with the animal cell membrane as their entry mechanism.
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