[BIO 311D] - Final Exam Guide - Everything you need to know! (55 pages long)
Document Summary
25. 3: key events in life"s history include the origins of unicellular and multicellular organisms and the colonization of land: the study of fossils engendered geologic record: a standard time scale that divides. Some species survived in anaerobic habitats: diverse adaptations evolved: cellular respiration. Evidence: fossilized fern galls two groups of vertebrates alive today. 39. 1: signal transduction pathways link signal reception to response: example: a forgotten potato in the back corner of a kitchen cupboard, beginning: ghostly pale stems, short and stubby roots, unexpanded leaves, etiolation: morphological adaptations for growing in darkness. Would lose water faster with expanded leaves. No need for complicated root system because no need for water replacement. No need to waste energy making chlorophyll (no light) instead: allocation of energy to elongating stems. Allows shoots to break ground before nutrient reserves in tuber are exhausted: when a shoot reaches light, it experiences de-etiolation aka greening. Stem elongation slows leaves expand and roots elongate.
