Provide "acknowledged body of knowledge" related to the concept. Emphasize the most significant aspects of the concept in an organized, organic manner. Present information sequentially so students see continuity. Draw attention to important, discrete details; don't swamp students with myriad facts.

Analysis of demo presentation of lesson on enzymes.

Objective: To teach the structure and function of enzymes in lowering activation energy so that substrates can be joined or separated in a chemical reaction without the addition of heat.

Activity: The students need to answer some questions. 1) What is heat? 2) What does heat provide for this reaction? 3) How was heat like a matchmaker? 4) What is the physical color change an indication of? 5) Can a reaction that needs a boost always make use of heat? At this point the teacher introduces the concept of a catalyst or enzyme, defining the action of bond breaking and forming, activation energy, substrates, end products, specificity, active site. During these potentially abstract concepts, it is helpful to use visual aids. Most traditionally, enzymes are described as lock and keys or puzzle pieces. Cut out large puzzle pieces from different color poster boards or actually take your key and fit it in the classroom door, then take someone else's house key and try it. What makes a key specific is its shape. Enzymes are proteins that also have a specific shape. If something de-shapes the enzyme, it doesn't fit anymore.

Assessment: A short quiz on enzyme structure and function.