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By James Morris et al.

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35 Water: The Medium of Life 35 Water is a polar molecule. 35 A hydrogen bond is an interaction of a hydrogen atom and an electronegative atom. 35 Hydrogen bonds give water many unusual properties. 36 pH is a measure of the concentration of protons in solution. 37 nonliving matter? 2 10 10 HOW DO WE KNOW? Can microscopic life arise from nonliving matter? xxxviii Properties of Atoms 7 HOW DO WE KNOW? 4 29 dinosaurs? The scientific method shows that living organisms come from other living organisms.

5 Receptor Kinases and Long-Term Responses 191 Receptor kinases phosphorylate each other, activate intercellular signaling pathways, lead to a response, and are terminated. 192 ? How do cell signaling errors lead to cancer? Signaling pathways are integrated to produce a response in a cell. 1 Tissues and Organs 198 VISUAL SYNTHESIS Harnessing Energy: Photosynthesis and Cellular Respiration ? CASE 2 Cancer: When Good Cells Go Bad CHAPTER 9 CELL SIGNALING 172 176 179 Tissues and organs are communities of cells.

405 The Hardy–Weinberg equilibrium describes situations in which allele and genotype frequencies do not change. 430 Development proceeds by progressive regionalization and specification. 406 The Hardy–Weinberg equilibrium relates allele frequencies and genotype frequencies. 431 Homeotic genes determine where different body parts develop in the organism. 408 The Hardy–Weinberg equilibrium is the starting point for population genetic analysis. 4 Natural Selection 432 410 Natural selection brings about adaptations.

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