Multiple Choice
Bacteriophages and animal viruses do not differ significantly in which one of the following steps of their replication cycles?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
Multiple Choice
All of the following pertain to virus envelopes except ________.
A
they are present in all viruses
B
they contain viral glycoproteins important for attachment
C
they are derived from host cell membranes
D
they may help viruses evade the host immune system
Verified step by step guidance1
Step 1: Understand what a virus envelope is. A virus envelope is a lipid bilayer membrane that surrounds some viruses, derived from the host cell membrane during viral replication or release.
Step 2: Review the characteristics of virus envelopes: they contain viral glycoproteins that help the virus attach to host cells, they originate from the host cell's membrane, and they can help the virus evade the host immune system by mimicking host molecules.
Step 3: Analyze the statement 'they are present in all viruses.' Since not all viruses have envelopes (some are non-enveloped or 'naked' viruses), this statement is false.
Step 4: Compare the other statements to confirm they are true characteristics of virus envelopes: presence of viral glycoproteins, derivation from host membranes, and immune evasion capabilities.
Step 5: Conclude that the exception is the statement claiming envelopes are present in all viruses, as this is not true for all viruses.
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