which best describes viruses?\nviruses are nonliving infectious agents.\nviruses can replicate without a…

which best describes viruses?\nviruses are nonliving infectious agents.\nviruses can replicate without a host cell.\nviruses can be killed by strong antibiotics.\nviruses are similar to bacterial cells.

which best describes viruses?\nviruses are nonliving infectious agents.\nviruses can replicate without a host cell.\nviruses can be killed by strong antibiotics.\nviruses are similar to bacterial cells.

Answer

Answer:

A. Viruses are nonliving infectious agents.

Explanation:

Step1: Analyze virus - host relationship

Viruses cannot replicate without a host cell. They lack the cellular machinery for self - replication and metabolism on their own.

Step2: Consider antibiotic effectiveness

Antibiotics target bacterial cell structures and functions. Viruses do not have the same structures as bacteria, so antibiotics are ineffective against viruses.

Step3: Compare virus and bacterial cells

Viruses are not similar to bacterial cells. Bacteria are single - celled organisms with a cell membrane, cytoplasm, and often other organelles. Viruses are acellular, consisting of genetic material (DNA or RNA) surrounded by a protein coat, and sometimes an envelope. So the statement that viruses are nonliving infectious agents is correct as they do not have the characteristics of living organisms like metabolism and growth on their own but can cause infections.