Multiple Choice
Which of the following lists correctly identifies the three main criteria used to classify viruses?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
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Which of the following statements about viruses is true?
A
Viruses can replicate independently without a host cell.
B
Viruses are obligate intracellular parasites that require a host cell for replication.
C
Viruses are classified as living organisms because they carry out metabolic processes.
D
Viruses contain both DNA and RNA in their genetic material.
Verified step by step guidance1
Understand the nature of viruses: Viruses are unique infectious agents that cannot carry out metabolic processes or reproduce on their own.
Recall the definition of obligate intracellular parasites: These are organisms that must live and reproduce inside the cells of a host organism.
Analyze the statement 'Viruses can replicate independently without a host cell': This is false because viruses lack the cellular machinery needed for replication and must hijack a host cell's machinery.
Consider the classification of viruses as living or non-living: Viruses are generally not classified as living organisms because they do not perform metabolic activities independently.
Evaluate the genetic material of viruses: Viruses contain either DNA or RNA, but never both simultaneously, which distinguishes them from cellular organisms.
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