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Unit 3: Part 1 Vocab

Cell Transport, Photosynthesis & Respiration

selectively permeable a property of cell membranes that allows some substances to pass through, while others cannot
diffusion the process by which molecules move from an area in which they are highly concentrated to an area in which they are less concentrated
osmosis the diffusion of water molecules through a selectively permeable membrane
passive transport the movement of materials through a cell membrane without using energy
active transport the movement of materials through a cell membrane using energy
photosynthesis the process by which plants and some other organisms capture light energy and use it to make food from carbon dioxide and water
pigment a colored chemical compound that absorbs light
chlorophyll a green pigment found in the chloroplasts of plants, algae, and some bacteria
chloroplast a structure in the cells of plants and some other organisms that captures energy from sunlight and uses it to produce food
stomata the small openings on the undersides of most leaves through which oxygen and carbon dioxide can move
respiration the process by which cells break down simple food molecules to release the energy they contain
fermentation the process by which cells break down molecules to release energy without using oxygen
matter anything that has mass and takes up space
energy the ability to make change
producer an organism that can make its own food (autotroph)
consumer an organism that obtains food by eating other organisms (heterotroph)
decomposer an organism that breaks down waste and dead organisms and returns important materials to the nonliving environment
element a type of matter in which all the atoms are the same; cannot be broken down into simpler substances
atom the smallest unit of an element
compound two or more elements that are chemically combined
molecule the smallest unit of a compound
Created by: skrebbeks