Biology class. Must be 250 words must cite work. Paleontologists say that anatomically modern humans may have at one time shared the Earth with as many as three other closely related types – Neanderthals, Homo erectus and the dwarf hominids. Read Are humans still evolving? If we are still evolving, […]

You are given an isolated muscle with its motor nerve intact. This preparation is arranged so that you can make electrophysiological measurements from the nerve and the muscle as well as mechanical measurements of the muscle contraction. You observe that if caffeine is added to the fluid bathing the preparation, […]

1. The pka values of a compound with two ionizable groups are pk1=4.10 and pk2 between 7 and 10.  We have 10 mL of a 1.0 M solution of this compound at a pH of 8.0.  She adds 10.0 mL of 1.0 M HCL, which changes the pH to 3.20.  What is […]

1. While using a compound microscope, you observe a cell that is undergoing mitosis. You see double stranded chromosomes and a partial nuclear membrane. What phase is this cell in? 2. You are examining a slide showing cells undergoing mitosis. You see a cell in which a centriole is at […]