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3.2: Using Cell Parts and Their Functions – Student Edition (Human Biology)

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Draw students' attention to the key ideas by using posters or overhead transparencies.

Begin this section by doing the Mini Activity: Soap Bubbles in class.

Assign Mini Activity: A Drawing or Model of a Cell Membrane and discuss the role of models in science.

Complete the Apply Your Knowledge related to Passage through a Cell Membrane.

Assign Journal Writing that asks students to think of a place or building that allows only certain people to enter or leave, such as a ride at an amusement park or a building with security guards at the doors. Describe how that place regulates who can come and go. What criteria does it use? How does this compare to a cell membrane?

As you begin a discussion of the cell parts and their function, assign the Mini Activity: What Does Each Part of a Cell Do? so that students can add to the information regarding each structure as they go through this section, and ultimately the entire unit.

Point out and explain that chromosomes are parts of cells, but not an organelle.

Conclude this section by assigning Activity 2-1: Making a Cell Model.

Emphasize the big ideas of this section by discussing answers to the Review Questions.

Select appropriate Projects, if time permits.

At the end of the section, refocus students' attention on the key ideas.

A Drawing or Model of a Cell Membrane Students draw a picture or make a model of a cell membrane to show how lipids are arranged.

Soap Bubbles Students use soap bubbles to simulate the movement of molecules within the cell membrane.

Think of a place or building that allows only certain people to enter or leave, such as a ride at an amusement park or a building with security guards at the doors. Describe how that place regulates who can come and go. What criteria does it use? How does this compare to a cell membrane?

A suggested response will be provided upon request. Please send an email to teachers-requests@ck12.org.

Study the table in Figure 2.6. Then answer the following questions.

  1. Substance W is smaller than 5 nanometers (nm).
  2. Substance X is larger than 1 nm but smaller than 3 nm.
  3. Substance Y is larger than 3 nm but smaller than 5 nm.
  4. Substance Z is larger than 5 nm.
  5. If membranes with different pore sizes were available how could you determine the exact size of substance X? Use the different membranes to try each substance.

What Does Each Part of a Cell Do? Students keep a record of what each organelle or part of the cell does.

What Do You Think?

Why do you think it would be an advantage for a cell to have a membrane-bound nucleus?

A suggested response will be provided upon request. Please send an email to teachers-requests@ck12.org.

For each of the cell organelles or parts listed above, explain how each one contributes to the overall internal balance (homeostasis) of the cell to keep it functioning smoothly.

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6 , 7 , 8

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Feb 23, 2012

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Apr 29, 2014
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