bio - Chapter 1 DNA is the molecule of heredity Every...

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Chapter 1 - DNA is the molecule of heredity - Every living thing is made from the same things just put together differently. -Nothing lives w/o energy -Metabolism: reactions to energy ……. -Energy flow: the ultimate source is the sun, it is absorbed by the producers ect… (see chart 1.6) - Producers: make their own food - Consumers: eat food made by other organisms - Decomposers: break things down. Sensing & Responding - Organisms sense changes in environment and make responses to them - Receptors detect specific forms of energy (stimuli) - Allows maintenance of homeostasis - Example: plants respond by growing toward the sun. Levels of Organization Atom Molecule Organelle Cell Tissue Organ Organ system Multicelled organism Population Community Ecosystem Biosphere - Each level is a subset of the level below it. - Community = group of populations
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- Ecosystem = community& physical environment. Diversity of Life - Millions of different species, about 10 million or 100 million different species - Millions are extinct - Classification 3 Domains - Eubacteria (bacteria): all over the place such as e coli - Archaebacteria (ancient bacteria) in very extreme conditions bacteria. - Eukaryota have a nucleus Kingdoms Eukaryotes: protistans, plants, fungi, animals Prokaryotic organisms: - Single cell - No nucleus or organelles - Smaller, less complex - Eubacteria, archaea Eukaryotic - Single or Multicelled - Nucleus and other organelles - Larger, more complex - Protists, plants, fungi, & animals. - Artificial Selection: breeders are selective agents - Individuals exhibiting favored traits are bred. An example is domesticated dogs. Natural Selection - Individuals vary in some heritable traits.
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- Some forms are more adaptive so these become more common. - Those who have the adaptive traits survive and reproduce and there offspring reproduce. Antibiotic Resistance - Antibiotics are used to kill bacteria - Mutations for resistance exist, the bacteria which have the resistance survive and reproduce and there become more of them. The Nature of Science Inquiry - Principles of Science * All events can be attributed to natural causes - Do not invoke supernatural causes - Do not specifically exclude deity. * Natural laws apply at all places and all times. * People perceive events in similar ways. Misconceptions about Science 1. Scientists “prove” things 2. “It is just a theory.” A theory is a big idea based on many tests & challenges. 3. There is a conflict between science and religion. These are often complementary views that are beyond the natural world. Scientific Method Observation > hypothesis > experiment > conclusions - Something unexpected happens. - Explanation; if/ then prediction. Ex. If my clicker doesn’t work maybe my clicker is dead. - Controlled test; challenge prediction. Change clicker batteries and see what happens.
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