Biology > QUESTIONS & ANSWERS > BSC 444 Lecture 1 Questions & Answers | Questions with 100% Correct Answers | Updated 2023 (All)

BSC 444 Lecture 1 Questions & Answers | Questions with 100% Correct Answers | Updated 2023

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What are viruses? - ✔✔Viruses are very small, non-cellular, non-living parasites of cells. Viral genomes, which are composed of either DNA or RNA, are enclosed in a protein coat. Options for com... position of viral genomes - ✔✔dsDNA, ssDNA, dsRNA, ssRNA Viruses are dependent on their hosts for: - ✔✔• Building blocks such as amino acids and nucleosides • Protein-synthesizing machinery (ribosomes) • Energy, in the form of adenosine triphosphate (ATP) Where did viruses come from? (3 theories) - ✔✔Regressive evolution (of intracellular microorganisms), cellular origins (components of cells), independent entities (molecular precursors of cellular organisms) Regressive evolution viral origin theory - ✔✔viruses are degenerate life-forms which have lost many functions that other organisms possess & have only retained the genetic information essential to their parasitic way of life [Show More]

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