By Peter J. Russell, Paul E. Hertz, Beverly McMillan
Biology: The Dynamic technology is the 1st common biology textual content with an experimental strategy that connects historic learn, fresh advances completed with molecular instruments, and a glimpse of the long run during the eyes of favorite researchers engaged on key unanswered questions of the day. This finished framework does not come on the rate of crucial thoughts. relatively, it offers a significant, sensible context for studying the entire center fabric that scholars needs to grasp of their first direction. Written "from the floor up" with minimum jargon and crisp, user-friendly reasons of the present country of organic wisdom, the textual content helps scholars as they study the medical process-and the way to imagine as scientists do.
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Extra resources for Biology: The Dynamic Science, Volume 2
Example text
Many more would have died later but for a new experimental drug, penicillin. A product of Penicillium mold, penicillin fought the usually fatal infections of Staphylococcus aureus, a bacterium that enters the body through damaged skin. Penicillin was the first antibiotic drug based on a naturally occurring substance that kills bacteria. Until the disaster at the Cocoanut Grove, the production and use of penicillin had been a closely guarded military secret. But after its public debut, the pharmaceutical industry hailed penicillin as a wonder drug, promoting its use for the treatment of the many diseases caused by infectious microorganisms.
Distance run b. Average speed 22 12,000 Experimental lines 10,000 Revolutions/day Experimental lines run longer distances than control lines. Control lines 8,000 6,000 4,000 2,000 KEY 20 Revolutions/minute KEY Experimental lines run faster than control lines. Experimental lines Control lines 18 16 14 12 10 0 1 2 3 4 5 6 7 8 9 8 10 Generation 0 1 2 3 4 5 6 7 8 9 10 Generation conclusion: Because two measures of activity level responded to artificial selection, researchers concluded that variation in this behavioral character has a genetic basis.
The very existence of a common genetic code is powerful evidence for the relatedness of all forms of life. Moreover, some genes and their protein products are present in most living organisms, an observation that is most easily explained by the hypothesis of common ancestry. 13 Embryologic clues to evolutionary history. Related species often show similar patterns of embryonic development. The aortic arches (red), a two-chambered heart (orange), and a set of veins (blue) in an early human embryo are also present in the embryos of other vertebrates.