Biology: Science for Life

Biology: Science for Life

Colleen M. Belk, Virginia M. Borden, Colleen Belk, Virginia Borden

Language: English

Pages: 475

ISBN: 0321774337

Format: PDF / Kindle (mobi) / ePub

This issues-based, inquiry-driven biology book provides learners with the ability and desire to take an active and academic interest in the science issues they will regularly face in life. A five-part organization covers general principles in biology, genetics, evolution, human health, and humans and the environment. For an in-depth understanding of compelling contemporary topics—along with the biology that permeates these issues.

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of a scientific literacy that surpasses the rote memorization of facts. To make decisions that are individually, socially, and ecologically responsible, you must not only understand some fundamental principles of biology but also be able to use this knowledge as a tool to help you analyze ethical and moral issues involving biology. To help you understand biology and apply your knowledge to an everexpanding suite of issues, we have structured each chapter of Biology: Science for Life around a

that preceded the ancestors of modern multicellular organisms. Figure 3.10 Poison dart frog. This brightly colored frog contains glands in its skin that release poison when the frog is handled. The frog’s bright colors warn potential predators of its toxicity. One of the most compelling questions in biology is the source of this explosion of biodiversity. The sudden evolution of the immense diversity of life from simple, single cells is remarkable. Some scientists hypothesize that the evolution

and do little damage to the vine. Doctors use the defensive chemical in curare vines, curarine, as a muscle relaxant during surgery. The kingdom Plantae is the source of many well-known naturally derived drugs. Aspirin from willow, the heart drug digitalis from foxglove, the anticancer chemical vincristine from the rosy periwinkle, and dozens of other pharmaceutical products are derived directly from plants; hundreds of other drugs based on plant chemicals are produced via manufacturing

total of three rings across the width of the helix. Nitrogenous bases are held together across the width of the helix by weak bonds called hydrogen bonds. A:T base pairs have two hydrogen bonds holding them together. G:C pairs have three hydrogen bonds holding them together. Each strand of the helix thus consists of a series of sugars and phosphates alternating along the length of the helix, the sugar-phosphate backbone. The strands of the helix align so the nucleotides face “up” on one side of

phenotype. Hemophilia was common among European royal families but rare amongst the rest of the population. This was because members of the royal families intermarried so as to preserve the royal bloodlines. Mating between related persons is called inbreeding. The offspring of inbred matings tend to have more health problems than offspring produced from unrelated individuals because rare, diseasecausing alleles—such as those for hemophilia—are more likely to occur in related individuals. When

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