Human Bio chapter 1 and 4.9
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20 terms
Terms | Definitions |
|---|---|
 Biology | Scientific study of life |
| Biosphere | zone of air, land, and water at the surface of the earth in which living organisms are found |
| Atom | smallest particle of an element that displays the properties of the element |
| cell | smallest unit that displays the properties of life. Always contains cytoplasm surrounded by a plasma membrane |
| community | assemlage of population interacting with one another in the same environment |
| control group | a sample that goes through all the steps in an experiment but lacks the factor or is not exposed to the factor being tested |
| ecosystem | biological community together with the associated abiotic environment characterized by energy flow and chemical cycling |
| experimental group | a sample that is exposed to the factor being tested |
| organ | combination of two or more tissues performing a common function |
| organ system | group of related organs working together |
| population | organisms of the same species occupying a certain area |
| science | development of concepts about the natural world often by using the scientific method |
| tissue | group of similar cells that perform a common function |
| molecule | union of two or more atoms of the same element or the smallest part of a compound that retains the properties of that compount |
| Steps of the Scientific Method | 1. Make observation 2. Formulated hypothesis 3. Conduct experiment 4. Draw conclusion |
| 7 characteristics of living things | 1. organization 2. acquiring materials and energy 3. reproducing 4. growing and developing 5. homeostasis 6. respond to stimuli 7. evolve |
| classification system | domain kingdom phylum class order family genus species |
| homeostasis | maintenance of normal internal conditions in a cell or an organism by means of self-regulating mechanisms |
| negative feedback | mechanism that is present when a system resolves or corrects the "problem" |
| positive feedback | mechanism that brings about an increasing change in the same direction |
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