Genetics Homework #1 – Due in lecture Wednesday, January 14 1. A chemical called phenol (carbonic acid) destroys proteins but not nucleic acids, and strong alkali such as sodium hydroxide destroys both proteins and nucleic acids. In the Avery, MacLeod, and McCarty experiments with Streptococcus pneumoniae , what result would be expected if the S‐strain extract had been treated with phenol? If it had been treated with strong alkali? Phenol would not destroy the transforming activity, strong alkali would. 2. What are the three principal structural differences between DNA and RNA? RNA differs from DNA in three principal ways: (1) the sugar phosphate backbone contains ribose rather than deoxyribose; (2) RNA contains the base uracil (U) instead of thymine (T); (3) RNA usually exists as a single strand, although any particular molecule of RNA may contain short regions of complementary base pairs that can come together to form duplexes.
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This note was uploaded on 09/01/2011 for the course BICD 100 taught by Professor Nehring during the Winter '08 term at UCSD.