Which of the following is NOT true about mad cow disease in cattle and Creutzfeldt-Jakob Disease (the non-genetic type) in humans? Caused by a persistent viral infection over several years Brain pathology looks sponge-like ("spongiform") Represent a slow, progressive, degenerative, fatal disease of the brain Caused by prions, which are infectious proteins without DNA or RNA None of the other four answers (All are true)

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A: viruses need host cell machinery to replicate themselves.

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A: Note : Hi. Thanks for your questions. Since, you have posted multiple questions, we will solve first…

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.