unit 1- characteristics of life - mrs....
TRANSCRIPT
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Studying Life
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Learning Objectives § List the characteristics of living things. § Identify the central themes of biology. § Explain how life can be studied at different levels. § Discuss the importance of a universal system of
measurement.
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Biology
Biology is the study of life. But what IS life?
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Life has Many Levels of Organization 1. Cellular Level
§ Atoms à molecules à organelles à cells 2. Organismal Level
§ Tissues à organs à organ systems 3. Population Level
§ Population à species à biological community 4. Ecosystem Level
§ Biological community + physical habitat (soil, water, atmosphere)
5. The Biosphere § The entire planet thought of as an ecosystem
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Characteristics of Life
Genetic code
Grow and develop
Respond to their environment
Reproduce
Homeostasis
Metabolism
Evolve
Made of cells
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Cells are the smallest unit that can perform all of life’s processes.
The cell is the basic unit of life. Oraganisms can be: Multicellular (multiple cells) Unicellular (single-celled)
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Characteristics of Life (1.3) 1. Made up of basic units called cells 2. Based on a universal genetic code 3. Obtain and use materials & energy (metabolism) 4. Grow and develop 5. Reproduce 6. Respond to the environment (stimulus &
response) 7. Maintain a stable internal environment
(homeostasis) 8. Change over time (evolution)
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What adaptations have these organisms evolved?
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Fields of Biology Global Ecology Biotechnology Paleontology Entomology Molecular Biology
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Scientific Measurement
1 kilometer = _______ meters 1000
0.45 liter = _______ milliliters 450
5000 milligrams = _______ grams 5
130 meters = _______ kilometers 0.13
2500 milliliters = _______ liters 2.5
0.017 grams = _______ milligrams 17