Bio Exam 1 Review

Bio Exam 1 Review - Bio Exam 1 Review Chapter 1 A View of...

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Bio Exam 1 Review Chapter 1 – A View of Life Characteristics of Living Systems - Organized: begins with atoms molecules cell tissues organs organ systems organisms population community ecosystem biosphere o Each level is more complex than the one before it o The cell is the smallest, basic unit of all life o Unicellular organisms live independently - Emergent Properties: each level of organization has more properties than the previous o It is hard to predict the different interactions as the levels become more complex o All properties are controlled by the laws of physics and chemistry - Acquire materials and energy: need outside source of nutrients and energy o Energy is the capacity to do work It takes work to maintain the organization of the cell The sun is the ultimate source of energy – it drives photosynthesis o Metabolism is all the chemical reactions in a cell Anabolic reactions: promote abnormal cell growth Catabolic reactions: breakdown large molecules, release energy o Homeostasis is the maintenance of relatively stable internal conditions within set boundaries Maintained by systems that monitor internal conditions and make necessary adjustments - Respond to stimuli: detect changes in the environment and generate responses o Response often involves movement o Helps ensure survival, prevents harm, locates nutrients and energy, allows reproduction o Receptor detects change effectors takes form of movement - Reproduce and develop: all organisms live and die o Must reproduce to maintain population o Unicellular organisms split in two o Multicellular organisms pair sperm and egg cells divide eventually grows into adult o Genes contain specific information on how the organism should be ordered Made of DNA - Adapt to change: any modification that makes an organism suited to its way of life o Enhance ability to survive/reproduce o Natural selection has certain members of the species in inherit genetic changes that make them better suited to their environment
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o All living things are composed of DNA, carry out metabolic reactions to acquire energy Suggests all descended from a common ancestor Each species adapted over time to fit their environment Biosphere - Individual organisms belong to a population: all species that live in a certain area - Populations of communities interact with the physical environment to form an ecosystem - Ecosystems have chemical cycling and energy flows o Begin with photosynthetic plants which take in solar energy o Consumers get energy from other organisms o Decomposers take remains and recycle o Energy flows, chemicals cycle and are reused - Biodiversity is the total number and relative abundance of species, the variability of their genes, and the different ecosystems in which they live o There are 15 million species - Extinction is the death of a species o We are losing 400 species per day Classification - Taxonomy is the discipline of identifying and classifying organisms according to
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This note was uploaded on 04/07/2008 for the course BIO 101 taught by Professor Pott-santone during the Fall '08 term at Northeastern.

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Bio Exam 1 Review - Bio Exam 1 Review Chapter 1 A View of...

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