Scelta multipla
Which of the following is a characteristic of a virus?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
Scelta multipla
Why are viruses often considered to be nonliving?
A
They cannot carry out metabolic processes independently.
B
They can reproduce on their own without a host cell.
C
They are able to synthesize their own ATP.
D
They are composed only of proteins and lack genetic material.
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Understand the definition of living organisms: Living organisms typically carry out metabolic processes, grow, reproduce independently, and respond to their environment.
Analyze the characteristics of viruses: Viruses consist of genetic material (DNA or RNA) enclosed in a protein coat, but they lack cellular structures and metabolic machinery.
Consider the ability of viruses to reproduce: Viruses cannot reproduce on their own; they require a host cell to replicate their genetic material and produce new virus particles.
Evaluate metabolic activity: Viruses do not carry out metabolic processes such as energy production (e.g., ATP synthesis) independently; they rely entirely on the host cell's metabolism.
Conclude why viruses are considered nonliving: Because viruses cannot independently perform metabolic functions or reproduce without a host, they are often classified as nonliving entities.
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