By James Morris et al.
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14 Metabolism converts energy from the environment into a form that can be used by cells. Carbon: Life’s Chemical Backbone 37 14 Carbon atoms form four covalent bonds. 38 A virus is genetic material in need of a cell. 15 Evolution 15 Carbon-based molecules are structurally and functionally diverse. 38 Variation in populations provides the raw material for evolution. Organic Molecules 39 15 Functional groups add chemical character to carbon chains. 5 Proteins are composed of amino acids. 40 Nucleic acids encode genetic information in their nucleotide sequence.
17 HOW DO WE KNOW? 6 3 laboratory? 18 Ecological Systems 19 Basic features of anatomy, physiology, and behavior shape ecological systems. 19 Ecological interactions play an important role in evolution. 20 The Human Footprint 20 ? 1 The Scientific Method 4 Observation allows us to draw tentative explanations called hypotheses. 4 A hypothesis makes predictions that can be tested by observation and experiments. 5 General explanations of natural phenomena supported by many experiments and observations are called theories.
B. Wernick, University of Massachusetts, Lowell Mary E. White, Southeastern Louisiana University David Wilkes, Indiana University, South Bend Frank Williams, Langara College Kathy S. Williams, San Diego State University Lisa D. Williams, Northern Virginia Community College Christina Wills, Rockhurst University Brian Wisenden, Minnesota State University, Moorhead David Wolfe, American River College Ramakrishna Wusirika, Michigan Technological University G. Wyngaard, James Madison University James R.