By Gwendolyn R. W. Burton
Entrance diversity group collage, Westminster, CO. Brandon/Hill Nursing checklist first-purchase (#180) and Brandon/Hill Allied well-being checklist choice (#172). Textbook of clinically orientated microbiology for college kids. This version contains new appendices, perception containers and learn aids, and new phrases. past variation: c1996. Softcover.
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Extra info for Microbiology for the Health Sciences (7th Edition, 2003)
Example text
Once scientists became convinced of the existence of tiny creatures that could not be observed with the naked eye, they began to speculate on their origin. On the basis of observation, many of the scientists of that time believed that life could develop spontaneously from inanimate substances, such as decaying 15 16 CHAPTER 1 corpses, soil, and swamp gases. The idea that life can arise spontaneously from nonliving material is called the theory of spontaneous generation or abiogenesis. For more than two centuries, from 1650 to 1850, this theory was debated and tested.
Interestingly, Leeuwenhoek was not a trained scientist. At various times in his life he was a fabric merchant, a surveyor, a wine assayer, and a minor city official in Delft, Holland. As a hobby, he ground tiny glass lenses, which he mounted in small metal frames, thus creating what today are known as single-lens microscopes or simple microscopes. During his lifetime, he made more than 500 of these microscopes. Leeuwenhoek’s fine art of grinding lenses that would magnify an object to 200–300 times its size was lost at his death, because he had not taught this skill to anyone during his lifetime.
The membrane that serves as a “skin” around the nucleus is called the nuclear membrane; it contains holes (nuclear pores) through which large molecules can enter and exit the nucleus. Eucaryotic chromosomes consist of linear DNA molecules and proteins (histones and non-histone proteins). Genes are located along the DNA molecules. Although genes are sometimes described as “beads on a string,” each bead (gene) is actually a particular segment of the DNA molecule. Each gene contains the genetic information that enables the cell to produce a gene product.