QQuestionBiology
QuestionBiology
"Why are viruses considered to be nonliving?
A. They have no genetic material.
B. They cannot reproduce without a host cell.
C. They do not respond to their environment.
D. They cannot use energy."
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Answer
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Step 1:Let's solve this step by step:
Step 2:: Understand the characteristics of living organisms
Living organisms typically have several key characteristics: - Contain genetic material - Can reproduce independently - Respond to environmental stimuli - Use and metabolize energy - Grow and develop - Maintain homeostasis
Step 3:: Analyze the characteristics of viruses
Viruses: - Contain genetic material (DNA or RNA) ✓ - Cannot reproduce without a host cell - Do not independently respond to environment - Cannot generate or use energy independently - Do not grow or develop on their own - Require host cell machinery for replication
Step 4:: Evaluate each answer choice
A. "They have no genetic material" - FALSE - Viruses DO have genetic material (DNA or RNA) B. "They cannot reproduce without a host cell" - TRUE - Viruses require host cell machinery to replicate - They cannot reproduce independently - Must hijack host cell's reproductive mechanisms C. "They do not respond to their environment" - TRUE, but not the best answer D. "They cannot use energy" - TRUE, but not the most precise explanation
Step 5:: Select the most comprehensive answer
The most precise explanation is B: Viruses cannot reproduce without a host cell.
Final Answer
Explanation: Viruses lack independent reproductive capabilities and must use host cell machinery to replicate, which fundamentally distinguishes them from living organisms.
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