LIFESCI 1 Lecture Notes - Lecture 1: Cytoplasm, Francesco Redi, Cell Membrane

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Standard deviation = experimental uncertainty = 0. 1. Percent uncertainty = experimental uncertainty x 100: remember sig figs for exam! Disciplined/controlled ways of asking/answering questions without bias: hypothesis (tentative explanations that must be testable) 1) makes predictions about observations not yet made or experiments not yet done. 2) can devise an experiment to see if predictions are right. 3) can be rejected or supported, but not proven: scientific method = deliberate and careful way of asking questions about the unknown, flowchart: Experiment (if results don"t support hypothesis, go back to hypothesis to reject or revise) Theory (if results support hypothesis after many experiments, then hypothesis will be a theory: theory = general explanations of natural phenomena supported by many experiments and observations. Hypotheses are only 1 way (of many) to explain existing data. When lots of related hypotheses survive repeated testing and become a good base for explaining nature = becomes a theory.

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