TLC science vocabulary words
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50 terms
Terms | Definitions |
|---|---|
 mass | measure of the amount of matter in an object |
| International System of Units = metric system | universal system of measurement scaled on the multiples of ten |
| mixture | substance composed of two or more elements or compounds that are mixed together but not chemically combined |
| molecule | collection of two or more atoms covalently bonded |
| nucleus | in atoms, the center, which contains neutrons and protons and accounts for 99.9 percent of the atom's mass; in cells, the organelle that controls the cell's activities and contains DNA |
| organ | group of tissues that work together to perform a specific function |
| organ system | group of organs that work together to perform a specific function |
| organelle | cell structure that performs a specialized function within the cell |
| photosynthesis | process in which autotrophs make their own food using the energy in light and CO2 and H2O |
| phylum | group of closely related classes |
| physical property | characteristic of matter that can be observed and measured without permanently changing the identity of the matter |
| population | collection of individuals of the same species in a given area whose members can breed with one another |
| solution | homogeneous mixture in which one substance is dissolved in another |
| species | group of organisms that share similar characteristics and can interbreed with one another to produce fertile offspring |
| taxonomy | science of naming organisms and assigning them to groups |
| atom | smallest particle of matter that can exist and still have the properties of a particular kind of matter |
| binomial nomenclature | classification system in which each organism is given a two-part scientific name |
| cell | basic unit of structure and function in living things |
| cell membrane | cell structure that regulates the passage of materials between the cell and its environment; aids in the protection and support of the cell |
| cell theory | understanding that all living things are composed of cells and that all cells come from preexisting cells |
| Celsius (C) | metric temperature scale on which water freezes at 0° and boils at 100° |
| chemical properties | properties that describe a substance's ability to change into a new substance as a result of a chemical reaction |
| cytoplasm | area between the nucleus and cell membrane of a cell |
| ecology | study of the interactions of organisms with one another and with their physical surroundings |
| ecosystem | division of the biosphere consisting of all the biotic and abiotic factors that surround organisms and affect their way of life |
| electron | negatively charged subatomic particle located outside the atomic nucleus |
| eukaryote | organism made up of cells that have a nucleus |
| homeostasis | process by which organisms keep internal conditions constant despite changes in their external environments |
| kilogram (kg) | basic metric unit of mass |
| kingdom | group of closely related phyla |
| element | substance consisting entirely of one type of atom |
| prokaryote | single-celled organism whose cells do not have a nucleus |
| proton | positively charged subatomic particle located in the nucleus |
| neutron | subatomic particle that is electrically neutral and is located in the atomic nucleus |
| matter | something that has mass, occupies space, and exists as a solid, liquid, gas, or plasma |
| compound | matter composed of two or more elements chemically bonded |
| chemical bond | the attraction between atoms in a molecule or crystalline structure |
| chemical formula | a representation of a substance using symbols for its constituent elements |
| heterogeneous mixture | any combination of substances that does not have uniform composition and properties; a mixture of physically distinct substances with different properties |
| homogeneous mixture | any combination of substances that has uniform composition and properties; a mixture that is uniform throughout |
| weight | the force that gravitation exerts upon a body. An object's weight depends on its mass and the strength of the gravitational pull. |
| energy level | The term is most commonly used for the energy levels of electrons in atoms or molecules, which are bound by the electric field of the nucleus. Electrons in an atom, for example, can shift between the different energy levels corresponding to orbitals in different shells. |
| habitat | The area or type of environment in which a particular kind of animal or plant usually lives. |
| biotic factors | Biotic, meaning of or related to life, are living factors. Plants, animals, fungi, protist and bacteria are all biotic or living factors. Living aspects of an environment, such as any organism in the 6 kingdoms. Biotic Factors are the living organisms that make up an ecosystem. |
| abiotic factors | pertaining to any non-biological factors that play a role in an organism's environment; non-living environmental factors. Abiotic, meaning not alive, are nonliving factors that affect living organisms. Environmental factors such habitat, or weather such as temperature, cloud cover, rain, snow, hurricanes, etc. are abiotic factors |
| epithelial tissue | membranous tissue covering internal organs and other internal surfaces of the body |
| stress | a specific response by the body to a stimulus, as fear or pain, that disturbs or interferes with the normal physiological equilibrium (homeostasis) of an organism |
| connective tissue | Body tissue that serves to connect or support other tissues or parts. Cartilage, tendons, and bone are all kinds of connective tissue |
| tissue | An aggregation of morphologically similar cells acting together to perform one or more specific functions in the body. There are four basic types of tissue: muscle, nerve, epidermal, and connective |
| community | an assemblage of interacting populations occupying a given area |
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