What is a key characteristic of viruses?

Prepare for the VCE Biology Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Viruses are unique entities that differ from cellular life forms in several fundamental ways. A key characteristic that defines them is their genetic composition; specifically, they contain either DNA or RNA encapsulated within a protective protein coat, also known as a capsid. This genetic material is essential for the virus's ability to infect host cells and replicate.

The presence of either DNA or RNA is crucial for the virus since it allows them to hijack the cellular machinery of a host organism to produce more virus particles. The specific type of nucleic acid (DNA or RNA) determines the virus's classification and how it operates within a host.

This feature distinguishes viruses from other biological entities, as they lack the necessary components for independent reproduction and do not possess cellular structures. Consequently, options relating to viruses reproducing independently, lacking genetic material, or being composed solely of lipids do not accurately capture their essential characteristics.

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