lecture06

lecture06 - 20.106J Systems Microbiology Lecture 6 Prof....

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20.106J – Systems Microbiology Lecture 6 Prof. Schauer ¾ Problem set 2 due next lecture ¾ First exam next week ¾ Reading covered today: Brock, Chapter 9 ± General properties of viruses o Viruses are characterized by being able to replicate their nucleic acids independent of the cell, but completely dependent on the cellular function o There are huge numbers of viruses out there o They infect people, animals, plants, bacteria (bacteriophage) o Extracellular forms (virions) just wait, until they can become active o There are bacteria that live symbiotically/parasitically in other cells, so that they cannot live independently, but these are not viruses ± One clear way to distinguish them is that bacteria have both DNA and RNA, while viruses have only one or the other o Viruses have a huge range in size o Viruses are essential tools for genetic analysis ± Also for genetic engineering, synthetic biology ± Viral structure o Nucleic acid can be quite long, coiled. The size of the virion is limited by the size of the nucleic acid. o
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lecture06 - 20.106J Systems Microbiology Lecture 6 Prof....

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