Biology: Science of Life Ch.1. (1-1) Characteristics of Life 1.Organization & Cells 2.Response to...
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Transcript of Biology: Science of Life Ch.1. (1-1) Characteristics of Life 1.Organization & Cells 2.Response to...
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Biology: Science of Life
Ch.1
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(1-1) Characteristics of Life
1. Organization & Cells
2. Response to Stimuli
3. Homeostasis
4. Metabolism
5. Growth & Development
6. Reproduction
7. Change thru Time
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Organization
• Cells: basic unit of life• Tissues: groups of cells w/ similar functions
– Muscle tissue
• Organs: tissues carry out specialized jobs– Lung
• Organ Systems: organs that work
together to perform a task– Respiratory system
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Figure 41.2
Stomach as an Organ Within Digestive System
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Cell Structure & Function
• Unicellular: 1 cell– Bacteria
• Multicellular: many cells– Humans
• Differentiation: cells become specialized
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Why cells specialize:"A jack of all trades is master of none"
Doing it all means not doing any one thing really well.
Example of tradeoff
Fully-f eatured Swiss Army knif e does many jobs, but each tool can be awkward to use.
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Response to Stimuli
• Stimulus: change in the internal or external environment– Dilating pupils
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Homeostasis
• Stable internal conditions
• Ex: – Temperature
• Ex: Thermostat
– Water intake– Food intake– pH
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Metabolism
• Sum of all chemical rxns that take in & transform E & materials from the environment
• Photosynthesis: converts light E into chemical E
• Cellular Respiration: converts organic cmpds into usable E (ATP)
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Growth & Development
• Cell division: formation of 2 cells from an existing cell
• Development: process by which an organism grows – Repeated cell divisions & differentiation
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Reproduction
• DNA (deoxyribonucleic acid): large molecule of hereditary info
• Gene: segment of DNA that contains instructions for development of a single trait
• Sexual (2 1) vs. Asexual (1 2) reproduction
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Change Thru Time
• Evolution
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(1-2) Themes of Biology
• 3 major themes1. Diversity & Unity of Life
2. Interdependence of Organisms
3. Evolution of Life
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Diversity & Unity of Life
• All living things have in common:– Genetic code– Tree of Life (lineages)
• 3 domains• 6 kingdoms
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Interdependence of Organisms
• Ecology: study of the relationship b/w organisms & their environment
• Ecosystem: all the biotic & abiotic (nonliving) components of an environment
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Evolution of Life
• Adaptations: traits that improve ability to survive & reproduce
• Natural selection: organisms w/ favorable traits reproduce at higher rates than those w/out such traits– “Survival of the fittest”
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(1-3) Scientific Method
1. Observe2. Hypothesize
• Explains observations & data & can be tested (“if, then”)
3. Predict4. Experiment
• Qualitative vs. quantitative (#’s) data
5. Communicate– Theorize: well-tested explanation of observations
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Experiment Variables
• Control group: standard– Hunts in light
• Experimental group: identical to control except 1 factor– Hunts in dark
• Independent variable: manipulated variable– Amount of light
• Dependent variable: responding variable– Distance of owl’s strike
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(1-4) Microscopes
• Instrument that produces an enlarged image of an object
• Ex:– Light (living)– Electron (nonliving)
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Measurement
• SI: standard system of measurement used by scientists
• Base units: 7 fundamental SI units– Length: m– Mass: kg– Time: second