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14 Cards in this Set
- Front
- Back
What is Life?
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1. Order: complex organization
2. Regulation: maintain a stable internal environment 3. Growth & development4. Energy processing: take in & use energy 5. Response to environment 6. Reproduction 7. Evolutionary adaptation: individuals with the best traits pass them on to their offspring |
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Life is organized in a hierarchy
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–Life is organized in a hierarchy Figure 1. Biosphere: Madagascar 2. Ecosystem: Forest in Madagascar 3. Community:All organisms in the forest 4. Population:Group of ring-tailed lemurs 5. Organism: Ring-tailed lemur 6. Organ system:Nervous system 7. Organ: Brain Tissue 8. Nervous tissue: Nerve, Spinal, and cord Brain 9. Cell 10. Organelle: Nucleolus 11. Cell:Nerve cell 12. Molecule: DNA |
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What are cells? |
Cells:
–Level at which life emerges! –Structure fits function•Ex: Nerve cells transmit messages –Common properties 1. Surrounded by membrane that regulates what goes in& out 2. Use DNA as genetic instruction |
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Types of Cells? |
–Types
1. Prokaryotic: small & simple 2. Eukaryotic: larger, contain organelles which have specific functions |
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How do cells Interaction with Environment? |
Producers photosynthesize: convert solar energy to chemical energy of food
• CO2 + H2O >> sugar + O2 – Consumers eat other organisms and respire to extract energy from their food • Food + O2 >> CO2 + H2O – Energy is gained & lost by an ecosystem – Materials are recycled within an ecosystem |
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Life’s great diversity is caused by?
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Variation in DNA
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What is Taxonomy?
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-Classifies organisms into groups based on similarities in physical & genetic characteristics
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Most inclusive taxonomic group: domain?
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1. Bacteria: tiny, unicellular, diverse, widespread prokaryotes
2. Archaea: prokaryotes that can live in extremeenvironments 3. Eukarya: protists, fungi, plants, animals |
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What is Evolution?
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populations change through time
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Define Natural Selection? |
mechanism that explains how evolution works
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Steps of Natural Selection? |
1. Individuals vary based on the DNA they inherit.
2. More offspring are produced than can survive. 3. Individuals with traits best suited to their environment will survive & produce offspring 4. Over time (MANY generations), favorable traits accumulate in a population |
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Science is?
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1. Testable: limited to what we can observe & measure
2. Reproducible: others must be able to duplicate findings 3. Predictive: useful for predicting answers 4. Tentative: new discoveries lead to modification or rejection of older ideas |
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Explain Types of Science? |
1. Discovery: describes life & nature– Ex: Human Genome Project– Ex: Darwin’s HMS Beagle voyage
2. Hypothesis-based: seeks explanations for observations (WHY??) – Hypothesis: proposed explanation for a set of observations – Theory: explains MANY observations and is supported by A LOT of evidence |
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Explain Science Process? |
1. Observation
2. Question 3. Hypothesis 4. Prediction 5. Test/Experiment 6. Support (never “prove”!) or reject hypothesis |
