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Cell Structures and Their Functions

Unit Plan

Cell Structures and Their Functions

Objectives

In this unit, students will learn about how cell structures function in the cell, with a focus on plant cells. Students will learn about the roles of cell structures in energy transfer during photosynthesis and cell respiration, and the transportation of materials. Students will:

  • relate the structures of membrane-bound organelles to their functions in energy transfer and transportation of materials.
  • describe the role of the plasma membrane in regulating cell activities and protecting the cell.
  • describe the role of ATP in photosynthesis, cell respiration, and active transport.
  • compare energy transfer during photosynthesis and cell respiration.
  • compare the various mechanisms of passive and active transport.

Essential Questions

Related Unit and Lesson Plans

Related Materials & Resources

The possible inclusion of commercial websites below is not an implied endorsement of their products, which are not free, and are not required for this lesson plan.

  • Cells Alive! Eukaryotic Cell Interactive Animation

www.cellsalive.com/cells/cell_model.htm

  • Cell Structures and Functions

http://library.thinkquest.org/12413/index.html

  • Respiration versus Photosynthesis

www.nclark.net/RespirationvsPhotosynthesis.pdf

  • Transport In and Out of Cells (tutorial)

www2.estrellamountain.edu/faculty/farabee/biobk/BioBooktransp.html

Formative Assessment

  • View

    Multiple-Choice Items:

    1.      Which function is carried out by the plasma membrane?

    A

    Synthesize the production of proteins

    B

    Modify and transport proteins in the cell

    C

    Regulate which materials enter and leave the cell

    D

    Carry out reactions that create energy for the cell

    2.      Which cell organelle does photosynthesis take place in?

    A

    Chloroplast

    B

    Endoplasmic reticulum

    C

    Golgi apparatus

    D

    Mitochondria

    3.      Which organelle does the cell send proteins to for modification after they leave the endoplasmic reticulum?

    A

    Nucleus

    B

    Vacuole

    C

    Mitochondrion

    D

    Golgi apparatus

    4.      Which process do most cells use to release chemical energy from glucose and other food molecules?

    A

    Active transport

    B

    Cell respiration

    C

    Passive transport

    D

    Photosynthesis

    5.      A biologist removes chloroplasts from a plant’s cells. What is a possible effect of removing chloroplasts from plant cells?

    A

    The cells would not carry out cell respiration.

    B

    The cells’ vacuoles would become smaller.

    C

    The plant would not be able to capture sunlight energy.

    D

    The plant would not be able to take in carbon dioxide.

    6.      Which molecules are the reactants for cell respiration?

    A

    Glucose and oxygen

    B

    Glucose, oxygen, and ATP

    C

    Carbon dioxide and water

    D

    Carbon dioxide, water, and ATP

    7.      Which of these statements best describes facilitated diffusion and active transport?

    A

    Facilitated diffusion requires energy from the cell, but active transport does not require energy from the cell.

    B

    Facilitated diffusion and active transport both use the concentration gradient for the direction they move molecules.

    C

    Facilitated diffusion does not use carrier proteins, but active transport uses carrier proteins for transportation.

    D

    Facilitated diffusion and active transport are both classified as active methods of moving molecules across the plasma membrane.

    8.      Which process does an organism use to move large molecules out of a cell?

    A

    Diffusion

    B

    Osmosis

    C

    Endocytosis

    D

    Exocytosis

    9.      Which process does not require ATP?

    A

    Active transport

    B

    Endocytosis

    C

    Exocytosis

    D

    Facilitated diffusion

    10.  What statement best describes the reaction to a cell when it is placed in a hypertonic solution?

    A

    It shrinks and shrivels.

    B

    It swells and bursts.

    C

    It cannot survive.

    D

    It stops making proteins.

     

    Multiple-Choice Answer Key:

    1. C

    2. A

    3. D

    4. B

    5. C

    6. A

    7. C

    8. D

    9. D

    10. A

     


    Short-Answer Items:

    11.  Explain the interaction of the mitochondria and the chloroplasts. What substances does each one produce that the other uses?

     

     

     

     

     

     

     

     

     

     

     

     

    12.  Compare and contrast the processes of active transport and passive transport. Give an example of each.

     


    Short-Answer Key and Scoring Rubrics:

    11. Explain the interaction of the mitochondria and the chloroplasts. What substances does each one produce that the other uses?

     

    Points

    Description

    2

    • Student explains that the mitochondria are the site of cellular respiration, which breaks down glucose to release energy for cells.
    • Student explains that the chloroplast is the site of photosynthesis, which converts sunlight energy into chemical energy that is stored as food molecules.
    • Student explains that mitochondria produce carbon dioxide which is used by the chloroplast; and the chloroplast produces ATP and glucose, which are used by the mitochondria.

    1

    • Student explains that the mitochondria are the site of cellular respiration.
    • Student explains that the chloroplast is the site of photosynthesis.
    • Student explains that mitochondria and chloroplasts produce substances that are used by each other.

    0

    • Student does not explain the role of mitochondria in energy transfer in the cell.
    • Student does not explain the role of chloroplasts in energy transfer in the cell.
    • Student does not describe which substances are created by the mitochondria and the chloroplasts.

     

     

    12. Compare and contrast the processes of active transport and passive transport. Give an example of each.

     

    Points

    Description

    2

    • Student explains that active transport requires ATP, but passive transport does not.
    • Student explains that active transport moves materials against the concentration gradient, but passive transport moves materials with the concentration gradient (may be stated as from high to low concentration).
    • Student states that both processes move materials across the plasma membrane and gives an example of each.

    1

    • Student explains that active transport requires energy, but passive transport does not.
    • Student explains that active and passive transport move materials depending on the concentration gradient.
    • Student states that both processes move materials across the plasma membrane, but does not correctly give examples.

    0

    • Student does not relate active and passive transport to energy.
    • Student does not explain that active and passive transport move materials depending on the concentration.
    • Student does not state that both processes move materials across the plasma membrane, and does not give examples/gives incorrect examples.

     


    Performance Assessment A:

    Create a resume for ATP applying for a job in a cell. Your role is the ATP, your audience is the cell’s human resources department, and the format is a resume. Your resume should include:

    • Your full name (What does ATP stand for?)
    • The type of job you are seeking
    • List of your skills/abilities
    • Your prior work experience
    • Your personal interests

    Make sure your resume includes the roles of ATP in photosynthesis, respiration, and active transport. Include the following other vocabulary terms: mitochondria, chloroplast, carrier protein, and concentration gradient.

    Performance Assessment A Scoring Rubric:

    Points

    Description

    5

    The student completes all five of the requirements:

    • Creates a resume that uses the analogy of ATP seeking a job in the cell.
    • Explains the role of ATP in photosynthesis.
    • Explains the role of ATP in respiration.
    • Explains the role of ATP in active transport.
    • Includes the required vocabulary terms: mitochondria, chloroplast, carrier protein, and concentration gradient.

    4

    The student completes four of the requirements.

    3

    The student completes three of the requirements.

    2

    The student completes two of the requirements.

    1

    The student completes one of the requirements.

    0

    The student demonstrates lack of understanding or does not attempt to complete the assessment. 

     


    Performance Assessment B:

    Create a flow chart that traces the formation of a protein, including the roles of the ribosomes, rough endoplasmic reticulum, and Golgi apparatus. Include how the cell can transport the protein to the plasma membrane and how the cell can release the protein. The cell chart should include how the cell releases the protein (Hint: It is a very large molecule), as well as the role of ATP.

     

    Performance Assessment B Scoring Rubric:

    Points

    Description

    5

    The student completes all five of the requirements:

    • Correctly sequences the steps in the flow chart.
    • Explains the role of the ribosomes in protein production.
    • Explains the role of the rough endoplasmic reticulum in protein production and transport.
    • Explains the role of the Golgi apparatus in protein production and transport.
    • Explains how the protein is released through exocytosis, a form of active transport (requiring ATP).

    4

    The student completes four of the requirements.

    3

    The student completes three of the requirements.

    2

    The student completes two of the requirements.

    1

    The student completes one of the requirements.

    0

    The student demonstrates lack of understanding or does not attempt to complete the assessment. 

     

     

DRAFT 05/26/2011
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