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biology-ks u1
| Question | Answer |
|---|---|
| levels of organization atomic level | atoms are defined as the smallest unit of an element that still maintains the property of that element ex. carbon, hydrogen, oxygen |
| levels of organization molecular level | atoms combine to form molecules which can have entirely different properties than the atoms they contain ex. water, DNA, carbohydrates |
| levels of organization cellular level | cells are the smallest unit of life. cells are enclosed by a membrane or cell wall and in multicellular organisms often perform specific functions ex. muscle cell, skin cell, neuron |
| levels of organization tissue level | tissues are groups of cells with similar functions ex. muscle, epithelial, connective |
| levels of organization organ level | organs are two or more types of tissues that work together to complete a specific task ex. heart, liver, stomach |
| levels of organization organ system level | an organ system is group of organs that carries out more generalized set of functions ex. digestive system, circulatory system |
| levels of organization organism level | an organism has several organ systems that function together' ex. human |
| prokaryotes | -single-celled organisms that lack internal structures surrounded by membranes -lack a true nucleus ex. bacteria, archaea |
| eukaryotes | -single-celled and multi--cellular organisms that have cells containing internal, membrane-bound structures -have a true nucleus containing the cell's DNA |
| unlike prokaryotic cells, eukaryotic cells have the capacity to... | assemble into multi-cellular organisms |
| inside eukaryotic cells are membrane-bound structures called... | organelles |
| what are life's levels of organization? | atom, molecule, organelles, cell, tissue, organ, organ system, organism, population, community, ecosystem, biome, biosphere |
| why is water a polar molecule? | -because the oxygen side is slightly negative and the hydrogen side is slightly positive -the three atoms are constantly at a tug of war for their electrons -polarity helps water to bind with other substances |
| cohesion | water tends to stick together ex. droplets of dew on grass |
| surface tension | the top layer of water is very strong ex. insects can walk on water |
| adhesion | water tends to stick to OTHER things ex. water sticks to glass after washing |
| capillary action | movement of water against gravity ex. allows water to rise narrow tubes in plant stems |
| high specific heat | water is able to resist changes in temperature ex. helps organisms retain body heat and resist freezing in cold temps |
| universal solvent | water can dissolve many things ex. putting sugar in tea |
| solvent | the material that is doing the dissolving |
| solute | the material that is dissolved |
| hydrophobic | not mixing with water |
| hydrophilic | mixing with water |
| density | the degree of compactness of substance ex. ice is less dense than water |
| which statement best describes an effect of the low density frozen water in a lake? | when water in a lake freezes, it floats, providing insulation for organisms below |
Created by:
amandathornton
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