Chapter 1- Invitation to Biology Flashcards
Levels of Organization
atoms>molecules>macromolecules>organelles>cells>tissues>organs>organ systems>organisms>population>community>ecosystem>biosphere
Characteristics of “living things”
- Consist of one or more cells
- Reproduce
- Grow
- Require energy
- Respond to stimuli in their environment
- Maintains homeo-stasis, maintaining a stable internal environment
Reproduce
Increase in number
Grow
Increase in size
Metabolism
Acquiring energy and using energy for maintenance, growth and reproduction
Where does energy come from?
Producers- make their own food using light or chemical energy (e.x. plants/autotrophs)
Consumers
Cannot make their own food: eat producers or each other (heterotrophs)
Respond
React to the environment; sense changes
Stimuli
Chemicals, light, touch, heat, pressure, etc.
Homeostasis
Maintains the internal environment within ranges suitable for cell activities
Steps of Scientific Inquiry (Biological Inquiry)
- Observations
- Hypothesis
- Prediction
- Test-experiment
- Collect Data
- Analyze Data
- Formulate Conclusions
- Retest
Scientific Theory
A hypothesis that has been tested over and over in many ways and has not been proven incorrect
- Has a high probability of being true
- Open to rejection
- Not a fact
Variable
A specific condition or event that can be changed from one group to the other
Control Group
- A standard for comparison
* Does not have the variable being tested
Experimental Group
Is exposed to one variable with all other conditions being the same from one group to the other.
