By what fundamental criteria are viruses sharply differentiated from bacteria? _______________?
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Answer: D. All of the above
Explanation
Viruses exhibit simple structures consisting of genetic material enclosed within a protective protein coat. Their genomes contain exclusively either DNA or RNA, unlike cellular organisms possessing both. Complex multiplication involves hijacking host metabolic machinery to assemble new viral progeny. Cellular life forms including bacteria possess complete metabolic machinery and cellular organelles. Viruses are obligate intracellular infectious agents lacking independent energy production systems. Ribosomes and protein synthesis pathways are entirely absent within isolated viral particles.
Understanding fundamental differences helps explain why antibacterial drugs fail against viral infections. Antiviral drug design must target specific steps in the unique viral replication cycle. Microbiological classifications separate living cellular microorganisms from non-living infectious entities. Possessing only one type of nucleic acid is a defining characteristic of all viruses. Having a simple structural organization distinguishes viral particles from complex bacterial cells. Relying on host metabolic machinery for multiplication separates viruses from autonomous bacteria.
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