Chapter 1 Chapter 1: Exploring Life 1.1 - 1.6

Unifying Themes in Biology Evolution~ biology’s core theme; differential reproductive success (sex!) Emergent Properties~ hierarchy of life The Cell~ all organism’s basic structure Heritable Information~ DNA Structure & Function~ form and function Environmental Interaction~ organisms are open systems Regulation~ feedback mechanisms Unity & Diversity~ universal genetic code Scientific Inquiry~ observation; testing; repeatability Science, Technology & Society~ functions of our world

Hierarchy of Organization Molecule Organelle Cells Tissues Organ Organism Population Community Ecosystem

Feedback Regulation: Negative Accumulation of an end product of a process slows that process Example: sugar breakdown generates ATP; excess ATP inhibits an enzyme near the beginning of the pathway

Feedback Regulation: Positive An end product speeds up its production Example: blood clotting in response to injury

The Process of Science The Scientific Method Hypothetico-deductive reasoning “If….then” Logic Hypothesis vs. Theory