Scientific American Biology for a Changing World

Scientific American Biology for a Changing World

Michele Shuster, Janet Vigna, Gunjan Sinha

Language: English

Pages: 608

ISBN: 1464126739

Format: PDF / Kindle (mobi) / ePub

From the groundbreaking partnership of W. H. Freeman and Scientific American comes this one-of-a-kind introduction to the science of biology and its impact on the way we live. In Biology for a Changing World, two experienced educators and a science journalist explore the core ideas of biology through a series of chapters written and illustrated in the style of a Scientific American article. Chapters don’t just feature compelling stories of real people—each chapter is a newsworthy story that serves as a context for covering the standard curriculum for the non-majors biology course.  Updated throughout, the new edition offers new stories, additional physiology chapters, a new electronic Instructor's Guide, and new pedagogy.

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product by a movie star e. a report on a study presented by a news organization 0 What is the importance of statistical analyses? a. They can reveal whether or not the data have been fabricated. 1 Process of Science Chapter 1  Test Your Knowledge 1 b. They can be used to support or reject the hypothesis. W h at i s L i f e m a d e o f ? Ch e m i s t r y, c e ll s , E n e r g y 18 c. They can be used to determine whether any observed differences between two groups are real or a result

it chirped. Finding the answer to question of whether there is life on Mars seems straightforward: look and see if anything is growing, or running around, or playing Xbox. By these measures, clearly, there is no life on Mars. The earliest pictures of Mars obtained by NASA’s Mariner 4 spacecraft revealed a dry, rocky landscape, more reminiscent of our lifeless moon than the lush, blue marble we call home. But what 24 W H AT I S L I F E M A D E O F ? C H E M I S T R Y, C E L L S , E N E R G Y 2

themselves. All organisms are made up of chemical building blocks such as water, ions, and organic molecules (see Chapter 2). Because humans (and other animals) can’t make these components from thin air, we need to obtain them from our diet. Nutrients also provide us with the energy needed to power essential life activities. Both building blocks and energy are crucial components of food, but for simplicity we will discuss them separately. This chapter focuses on food as a source of chemical

organizations) have experimented with providing related products, known as RUSFs (ready-touse supplemental foods), to hungry children around the world. These products, which provide less than the full therapeutic dose of nutri- Peanut butter RUTF tastes like the inside of a Reese’s Peanut Butter Cup. 4 N u t r i t i o n , M e ta b o l i s m , E n z y m e s to be hospitalized so that doctors and nurses could take care of them. But doctors who, like Manary, were working in the trenches, knew

l d i v i s i o n and i n h e r i tan c e M cytosine. This information was critical. As the helix had a smooth shape and a uniform thickness, and as the bases had to point toward the inside of the helix, the different-size bases somehow had to fit together in way that allowed for a consistent length of base pairs. Following a tip about the structure of bases, Watson and Crick were able to use a model to show that A–T pairs and G–C pairs were exactly the same length, explaining the consistent

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