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.

Provide info: use overheads & blackboard. Demos: alcohol/egg white pop beads.

Objective: To give the students the basic features of DNA as explained by Watson and Crick's model and to show how those structures explain its role in replication and protein synthesis by lecturing and critical questioning.

Activity: The teacher presents the classical, structural features of Watson and Crick's model of DNA. The important underlying concept is Structure determines Function. This critical information lays the foundation for an understanding of replication, protein synthesis and genetic engineering. While the purpose of this octant is to provide the learner with the facts, this does not mean that many visual means are not employed to make those facts as clear as possible. Demonstrations are particularly helpful in a topic that is abstract. A little egg white in a beaker, mixed with a bit of rubbing alcohol and stirred with a glass rod is also an excellent simulation of what extracted DNA looks like. Pop beads and a long zipper are also invaluable when teaching DNA and its functions.

Assessment: A short test on the material presented.