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Download A Closer Look at Biology, Microbiology, and the Cell by Sherman Hollar PDF

By Sherman Hollar

Formalizing examine of the flora and fauna could appear like a frightening activity contemplating the sheer breadth and diversity of dwelling issues that inhabit the planet. From the microscopic organisms within the worlds such a lot distant destinations to these within the human physique, facts of the difficult buildings and mechanisms that allow existence are ubiquitous and new discoveries continuously demonstrate new percentages that call for to be tested. This quantity surveys the multitude of matters that contain the sector of biology and contains an outline of the improvement of biology, microbiology, and mobile conception.

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Extra resources for A Closer Look at Biology, Microbiology, and the Cell (Introduction to Biology)

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The 17th-century invention and development of the microscope revealed unknown processes and organisms. Dave King/Dorling Kindersley/Getty Images 30 History of Biology Development of the Microscope The invention and development of the microscope in the 1600s generated an explosion of interest in biological studies. The value of this important new research tool was phenomenal. Unsuspected processes and organisms unknown to science were discovered in a flurry of biological investigation. Anthony van Leeuwenhoek reported his observations of single-celled animal-like creatures (protozoa) invisible to the naked eye.

The cell membrane is semipermeable— that is, some substances can pass through it but others cannot. This characteristic enables the cell to admit or block substances from the surrounding fluid and enables the cell to excrete waste products into its environment. The cell membrane is composed of two thin layers of phospholipid molecules studded with large proteins. Phospholipids are chemically related to fats and oils. Some membrane proteins are structural. Others form pores that function as gateways to allow or prevent the transport of substances across the membrane.

Replica of Robert Hooke’s compound microscope. The 17th-century invention and development of the microscope revealed unknown processes and organisms. Dave King/Dorling Kindersley/Getty Images 30 History of Biology Development of the Microscope The invention and development of the microscope in the 1600s generated an explosion of interest in biological studies. The value of this important new research tool was phenomenal. Unsuspected processes and organisms unknown to science were discovered in a flurry of biological investigation.

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