Draw students' attention to the key ideas by using posters or overhead transparencies.
Begin this section with a discussion of enzymes and their roles in facilitating chemical reactions in the cell, building products, making copies of molecules and carrying out cell functions.
Complete Activity 3-1: Catalysts and Enzymes in Your Life.
Discuss Mini Activity: Transport of Nutrients: Exploring Diffusion. Have students compare and contrast the processes of passive and active transport.
Emphasize how a selectively permeable membrane functions; consider completing Enrichment 3-1: Exploring Osmosis.
Point out what occurs during cellular respiration.
Emphasize the difference between a somatic cell and a gamete cell.
Complete Activity 3-2: Cell Division-Double or Nothing with emphasis on cell division as one of the important events of the cell cycle.
Have students share their completed Mini Activity: Mitosis in Action.
Emphasize the big ideas of this section by discussing answers to the Review Questions.
Select appropriate Projects and other activities, if time permits.
At the end of the section, refocus students' attention on the key ideas.