Q. In an attempt to reduce levels of methicillin resistance in Staphylococcus aureus, methicillin use is completely halted. Let us suppose that in the absence of methicillin, neither the resistant allele (A), nor the sensitive allele (a) is selected against. New sensitive alleles arise with frequency 1 x 10-5, and […]

1) All Protist were once classified in a single kingdom called Protist, but today this classification has been abandoned. Are Protist a monophyletic group? Explain. What do they have in common? 2) Protist exhibit remarkable diversity regarding cell structure, ways of obtaining food, oxygen requirement, movement etc. Choose two organisms […]

A 26-year-old business executive complained of a dull pain (heartburn) behind the sternum. The pain was postprandial (occurred after meals) and disappeared within a few minutes to an hour. It was often associated with belching and often was worse on lying down or on exertion after heavy meals. Sometimes it […]

Go to this or other histology links you might find: http://www.bio.davidson.edu/courses/Immunology/Bio307.html These all have either cartoons and/or histology sections of all the important primary and secondary lymphoid organs that we talked about. Click through their sections, readings, and animations of primary and secondary lymphoid organs. In particular: 1. Try to […]