Cell membrane, A cell structure that controls which substances can enter or leave the cell., Cell wall, A rigid structure that surrounds the cell membrane and provides support to the cell. It is made up of cellulose in plants, Nucleus, A cell structure that contains nucleic acids such as DNA, the chemical instructions that direct all the cell's activities., Cytoplasm, Gel-like fluid where the organelles are found and where chemical reactions take place., Mitochondria, Involved in respiration, produces energy for the cell., Chloroplast, An organelle found in plant and algae cells where photosynthesis occurs. Contains the pigment chlorophyll that traps light., Vacuole (permenant), A water-filled sac inside a cell that acts as a storage area. Usually found in plant cells., Ribosomes, An organelle involved in protein synthesis

Cell structures

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