BCOR 12 1st Edition Lecture 1 Outline of Current Lecture I. Major Themes in BiologyII. Chapter 22 – Descent with ModificationCurrent LectureMajor Themes in Biology1. New properties emerge at each level in the biological hierarchya. Becomes more complex at each level2. Organisms interact with their environment exchanging matter and energy3. Structure and function are correlated at all levels of biological organizationa. Anatomy and physiology4. Cells are organisms basic unit of structure and functiona. They’re the most basic unit of life and this makes sense since organisms are made up of more than one cell5. The continuity of life is based on heritable information in the form of DNA6. Feedback mechanisms regulate biological systems a. HomeostasisEvolution – the overarching theme in biology that allows us to understand the unity and diversity of lifeHomologous structures – structures in different species that are similar because of common ancestryEx. Whales, humans, cats all have the same forelimb bone structures yet the species are extremely different- Evolution is both a pattern and a process- Examples of evolution: vestigial structures, deep sea creatures, embryology (certain species look very similar when they are an embryo), fossil records, characteristics (unique to) endemic speciesKey Observations of Life1. Organisms are well suited for living in THEIR environment a. Ex. A cactus is suited to live in a desert not the forest for that’s not their environment2. Living organisms share many characteristics (DNA). This demonstrates the UNITY of life3. The Earth has a large, rich DIVERSITY of living organismsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.The 3 Domains of Life:- Archaea – extremophiles - Eukaraya-
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