05_lecture_activity3

05_lecture_activity3 - Chapter 5 Cell Structure and...

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Chapter 5 Cell Structure and Function Lecture Activity 3 Lecture Activity 3: Cell Structure and Function Case Studies Estimated Time to Complete: 10 minutes for group discussion, 20 minutes to report back to the class. This can be used to teach some of the major features of eukaryotic cells. Section Reference 5.3 What Are the Major Features of Eukaryotic Cells? Introduction In this activity, students are asked to apply their knowledge regarding the function of cell structures. Metabolic disorders and unique characteristics of some cells are used to illustrate the importance of individual structures. Materials Needed Use the case studies on the next two pages. You may want to assign one case study per group. Procedures 1. Divide the class into seven groups. 2. Assign a case study to each group (there are seven choices, see following pages) 3. For each cell component, ask the students to consider the following questions: a. What is the structure of the cell component referred to in your case study? Be as specific as possible. b. Where is it located in the cell? c. Is it found in plants/animals/bacterial cells? d. What is its normal function in the cell? Assessment Suggestions Include similar scenarios on an essay exam.
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2 Handout – Cell Structure and Function Case Studies Case 1 Erythrocytes (red blood cells) have no nucleus, mitochondria, or other organelles at maturity. These organelles are ejected when the RBC enters the bloodstream, or shortly thereafter. Should this still be considered a cell? What will be the effect of having no nucleus? In these cells, the lack of mitochondria is an advantage. Why? Because the cells have no nucleus, they cannot divide, or replace worn out plasma membrane. The plasma membrane becomes fragile and the cell eventually dies after 80–120 days, usually by rupturing in the spleen. The RBC is still considered to be a eukaryotic cell (although a dying one), because it had a nucleus and other organelles at one time in its life. http://www.rothamsted.bbsrc.ac.uk/notebook/courses/gu ide/blood1.htm Case 2 Pompe’s disease is one of a class of lysosomal storage diseases in which one or more enzymes that are normally found in the lysosomes are defective or absent. In Pompe’s disease, the enzyme that normally breaks down glycogen is absent. Describe what you would see in an
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05_lecture_activity3 - Chapter 5 Cell Structure and...

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