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An Hfr strain (arg+, bio+, leu+) is mated to an F- strain (arg-, bio-, leu-). Assume that this Hfr strain transfers arg+ last. You grow the exconjugants on arg- media, supplemented with leu+ and bio+. You recover 423 arg+ exconjugants. These are tested individually for bio and leu and you […]

Consider a limpet that is grazing on algae on inter-tidal rocks along California’s coast. It is a calm, sunny day. When the tide is low during the late morning, the ocean waters recede and the limpet’s internal body temperature will increase. What are the two physical processes that cause this […]

Q. 1. Based on the structure of individual keratin subunits, why would a single point mutation in the alpha-helical region of the monomer result in a defect in the polymer? 2. An alternative model is that the mutations cause defect intermediate filaments with defective structure that causes problems in the […]

Question: We did a lab for action/absorption spectrum where we covered leaves with different colored plastic. One with solid black, one with clear green, one with clear red, one with clear blue. I was assumed that the black would do the worst, followed by green, then red, then blue as the […]