BIO 309D S08 Lec1

BIO 309D S08 Lec1 - announcements Reading chapter 2 pages...

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announcements Reading: chapter 2 pages 20-33
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Outline Biology Characteristics of life Biological hierarchy Chemistry of life
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Humans in the World of Biology Biology - the study of life Life - describes characteristics of living things. Living organisms share 7 basic characteristics
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Living Organisms Share Basic Characteristics 1. Contain biomolecules - typically large organic molecules (contain carbon) - carbohydrates, proteins - work horse, lipids (fats), nucleic acids - dna and rna 2. Composed of cells Cells - smallest unit of life - smallest unit capable of having all of these characteristics 3. Reproduce Passing on genetic material to our offspring. All organisms reproduce their own kind. 4. Acquire and use energy and raw materials Get these things from the food you eat. Use them as source of energy 5. Respond to stimuli in the environment Use sensory organs used to detect changes in the environment 6. Maintain homeostasis To maintain a very stable internal environment 7. Populations evolve Evolve adaptive traits in order to survive
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Life Has Many Levels of Organization Life extends from the microscopic to the global scale Life if organized as an hierarchy, each level builds on the one below it.
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Molecule - formed by covalent interactions Cell - smallest unit of life with all the characteristics Tissues - group of cells that work together for the same function Organs - group of diff tissues working together for the same purpose Organ systems Individual - multiple organ systems Population Community - all of the species in a certain area Ecosystem - all of the living organisms in the set environment - biotic - living component, abiotic - nonliving components Biosphere - all habitable parts of the earth Molecules thru populations - Anatomy and physiology - the structure and function of the human body
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Basic Chemistry Helps Us Understand Human Biology Matter - everything that takes up space and has mass All forms of matter are made up of atoms
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Atoms Building blocks of matter Composed of subatomic particles
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This note was uploaded on 03/25/2008 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas.

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BIO 309D S08 Lec1 - announcements Reading chapter 2 pages...

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