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    bacteriophages and lysogeny

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    I) Why might have virology developed more slowly without the use of Chamberland's porcelain filter?

    ii) How are viruses classified? Give a complete account of the characteristics used in this process?

    iii) Describe the lytic and lysogenic life cycles of a bacteriphages. Include in your answer comparisons and contrasts between the 2 types of cycles.

    iv) Why would one not find temperate RNA phages?

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    Solution Preview

    i) The porcelain filter was important because it lead to the discovery of viruses. It was designed to filter out all infectious material, as it traps particles down to the size of bacteria. However scientists found that some infectious material was still present after passing diseased plant material through the filter, indicating the infectious agent was smaller than bacteria.

    ii) Viruses are classified mainly on the basis of their nucleic acid genomes. The genome can consist of single or double stranded DNA or single or double ...

    Solution Summary

    This solution addresses specific questions to illustrate the physical properties of viruses and their classification, in addition to the lytic and lysogenic lifecycles of bacteriophages. Lastly the issue of why it is not possible to have temperate RNA bacteriophages is addressed.