Biology: The Dynamic Science - download pdf or read online

By Peter J. Russell, Stephen L. Wolfe

Biology: The Dynamic technology is the 1st common biology textual content with an experimental strategy that connects historic study, fresh advances accomplished with molecular instruments, and a glimpse of the long run throughout the eyes of well-known researchers engaged on key unanswered questions of the day. This finished framework doesn't come on the price of crucial suggestions. quite, it offers a significant, lifelike context for studying the entire center fabric that scholars needs to grasp of their first path. Written "from the floor up" with minimum jargon and crisp, simple causes of the present nation of organic wisdom, the textual content helps scholars as they study the medical process-and find out how to imagine as scientists do.

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Biologists who conduct basic research search for explanations about natural phenomena to satisfy their own curiosity and to advance our collective knowledge of living systems. Sometimes, they may not have a specific practical goal in mind. For example, some biologists study how lizards control their body temperatures in different environments. At other times, basic research is inspired by specific practical concerns. For example, understanding how certain bacteria attack the cells of larger organisms might someday prove useful for the development of a new antibiotic (that is, a bacteria-killing agent).

2). Complex biological molecules exist at the lowest level of organization, but by themselves, these molecules are not alive. The properties of life do not appear until they are organized into cells. A cell consists of an organized chemical system, including many specialized molecules, surrounded by a membrane. A cell is the lowest level of biological organization that can survive and reproduce—as long as it has access to a usable energy source, the necessary raw materials, and appropriate environmental conditions.

Today, evolutionary biologists recognize that natural selection is just one of several potent evolutionary processes. Over many generations, the evolutionary changes in a population may become extensive enough to produce a new kind of organism. These new types are distinct from their ancestors and cannot interbreed with them. Nevertheless, parental and descendant species often share many characteristics, allowing researchers to understand their relationships and reconstruct their shared evolutionary history.

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