Traffic light activity Cells Divide these key words into three groups Red I don't know this word Orange I have seen this word, but I'm not confident about using it Green I understand this word and I'm confident to use it in a sentence Active site active transport aerobic ATP catalyst Cell membrane Cell wall respiration chloroplast co-factor Cristae cytoplasm denatured DNA enzyme Endoplasmic reticulum flaccid Golgi body lamellae Lipid bilayer mitochondria lysosome matrix nucleus Nucleolus organelles osmosis phagocytosis ribosome Rough ER Smooth ER substrate vacuole vesicle