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biology-ks u1

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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