| Cell Parts |
| Biology Cells Day 2(a) Science Probe 10, Chapter 15, pp. 330-346 Theme(s) covered: Scientific Method - interpretation PLO addressed: �relate organelles to their function within the cell� �distinguish between cells based on their different structures and functions� Objective(s): To gain appreciation for the wide range of tasks a cell carries out; to examine the ways cells are adapted to specific duties and environments. Materials, Resources, Info Sources: Overheads prepared by students covering structure and function of various cell parts. These should be handed in by the morning so that the teacher can photocopy them into a package. The package should add a cover page using the labeled animal and plant cell diagrams found in this package. There should be one package for each student to keep. Teacher�s Background Info: Cells have a variety of specialized structures and organelles that carry out all the tasks of the cell. The 11 used in this lesson may be researched in a Grade 12 biology text. The presentation order given below is significant in that every cell part relates in an important way to the previous cell part. Nucleus contains chromosomes, nuclear membrane contains nucleus, ribosomes make proteins using information from nucleus through nuclear pores, ER contains ribosomes, golgi transports proteins made by ribosomes in ER, vesicles are used by golgi for transport, cell membrane is where vesicles deliver many proteins, cell wall is found outside the cell membrane in plants, vacuoles work with cell wall to maintain structure of plant cells, the chloroplast is the other cell part found only in plants, and mitochondria work with chloroplasts in plant cells to power the cell. The reason for the latter is that chloroplasts make sugar using the sun�s energy and mitochondria use that sugar to make energy for the cell. Estimated Time for Activity: 55 min. Content: Student presentations of cell part structure and function In the previous lesson, pairs of students were assigned specific cell parts. They were asked to research their cell part and to create a 3 to 4-minute presentation about the part on one overhead sheet. The presentation must reveal the structure and function of the cell part: there must be a verbal description as well as one or more diagrams. It must also relate each part to the previous part presented. It may seem like showing this relationship is in some cases too difficult for students, but teacher should allow the presenters and then the class to find one. The teacher can of course assist them if they need help. The teacher will start the presentations off by describing the chromosomes as the containers of the genetic information of the cell. There are 11 cell parts: nucleus, nuclear membrane, ribosomes, endoplasmic reticulum (ER), golgi apparatus, vesicle, cell membrane, cell wall, vacuole, chloroplast, mitochondrion. Closure/Wrap-Up: Teacher talks about animal cells and plant cells as wholes. Teacher should attempt to sum up all of the interrelationships discussed before. The goal is that students can see cells as being �greater than the sum of their parts.� Teacher must remind students that they have their lab write-ups due in lesson 3 and that they will have a 10-minute quiz at on lesson 1 material in lesson 3. Assessment/Evaluation: Based on care and thought put into overheads and presentation. |