Raven & Johnson's Biology by Peter Raven, George Johnson, Kenneth Mason, Jonathan Losos,

By Peter Raven, George Johnson, Kenneth Mason, Jonathan Losos, Susan Singer

Committed to Excellence within the 11th Edition. This variation keeps the evolution of Raven & Johnson's Biology. the writer crew is devoted to repeatedly enhancing the textual content, keeping the coed and studying foremost. The built-in pedagogical positive aspects extend the scholars' studying approach and increase their studying event. This most recent version of the textual content keeps the transparent, available, and fascinating writing form of earlier variants with the cast framework of pedagogy that highlights an emphasis on evolution and medical inquiry that experience made this a number one textbook for college kids majoring in biology. This emphasis at the organizing strength of evolution is mixed with an integration of the significance of mobile, molecular biology and genomics to supply our readers a textual content that's pupil pleasant and current.
Our writer workforce is devoted to generating the very best textual content for either pupil and school. The lead writer, Kenneth Mason, University of Iowa, has taught majors biology at 3 varied significant public universities for greater than fifteen years. Jonathan Losos, Harvard University, is on the leading edge of evolutionary biology study, and Susan Singer, Carleton College, has been fascinated by technological know-how schooling coverage concerns on a countrywide point. All 3 authors deliver diversified tutorial and content material services to this variation of Biology.

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Two DNA polymers wind around each other like the outside and inside rails of a circular staircase. Such a winding shape is called a helix, and a helix composed of two chains winding about one another, as in DNA, is called a double helix. Each step of DNA’s helical staircase is a basepair, consisting of a base in one chain attracted by hydrogen bonds to a base opposite it on the other chain. 15). The base-pairing rules are rigid: adenine can pair only with thymine (in DNA) or with uracil (in RNA), and cytosine can pair only with guanine.

More than 95% of the weight of an organism consists of oxygen, hydrogen, carbon, and nitrogen, all of which form strong covalent bonds with one another. com Atoms are nature’s building material. • The smallest stable particles of matter are protons, neutrons, and electrons, which associate to form atoms. com/raven6e Part I The Origin of Living Things 6. What types of atoms participate in the formation of hydrogen bonds? How do hydrogen bonds contribute to water’s high specific heat? 7. What types of molecules are hydrophobic?

The pH of a solution is the negative logarithm of the H+ ion concentration in the solution. Thus, low pH values indicate high H+ concentrations (acidic solutions), and high pH values indicate low H+ concentrations (basic solutions). Even small changes in pH can be harmful to life. 20 Buffer formation. Carbon dioxide and water combine chemically to form carbonic acid (H2CO3). The acid then dissociates in water, freeing H+ ions. This reaction makes carbonated beverages acidic, and produced the carbon-rich early oceans that cradled life.

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