Biology Unit 3: Through the Cell Membrane


  • Explain how nutrients needed by cells get inside.
  • Explain how substances produced by cells get out.
  • Explain that the role of selective permeability and types of active and passive transport in the movement of materials into and out of cells is to maintain homeostasis in a living organism.

Course Essential Questions

  • How do substances get in and out of cells?
  • Why is this important?

Chapter 3.3 Cell Membrane

  • Define homeostasis. Give examples of how living organisms maintain homeostasis.
  • Describe the biological molecules that make up the cell membrane.
  • Describe the structure of the cell membrane as a fluid mosaic.
  • Describe the structures in a cell membrane used for signaling and how they work.
Chapter 3.4 Diffusion and Osmosis
  • Describe passive transport.
  • Explain that a concentration gradient is responsible for the movement of a substance through a membrane by passive transport.
  • Distinguish between osmosis, diffusion, ion channels, and facilitated transport.
  • Describe how water and solutes move through solutions or across membranes in hypotonic, hypertonic, and isotonic solutions.
  • Tell which process is used by gases, water, and small particles to enter or exit cells, and why.
Chapter 3.5 Active Transport, Endocytosis and Exocytosis
  • Describe active transport and explain how it is different from passive transport.
  • Explain how a protein pump works, using a sodium-potassium pump as an example.
  • Distinguish among endocytosis, exocytosis, and phagocytosis.

Links and Resources

Daily Learning Activities
Day 19 10/28

Cell membrane structure and cell theory

Day 20 11/3

Microscopy and measurement; check reading Ch. 3.3 Assign reading Ch. 3.4 Diffusion and Osmosis

Day 21 11/5

Passive Transport; Cell size activity

Day 22 11/7

Movement of Substances Through a Membrane Lab setup and initial data collection.

Assignment: Reading Ch. 3.5

Day 23 11/12

Collect second set of data on passive transport.

Review of types of passice transport and application to lab

Active Transport explanations

Day 24 11/14

Review and videos

Day 25 11/18 Proficiency; read Ch. 8.1
Day 26 11/26 Introduction to DNA

Next Generation Science Standards:

SEP 1 Asking questions (for science) and defining problems (for engineering)

SEP 3 Planning and carrying out investigations

SEP 4 Analyzing and interpreting data

SEP 5 Using mathematics and computational thinking

SEP 6 Constructing explanations (science) and designing solutions (engineering)

SEP 7 Engaging in argument from evidence

SEP 8 Obtaining, evaluating, and communicating evidence

Common Core State Standards:

RI.9-10.4 Determine the meaning of words and phrases as they are used in a text, including figurative, connotative, and technical meanings; analyze the cumulative impact of specific word choices on meaning and tone (e.g., how the language of a court opinion differs from that of a newspaper).

RI.9-10.6 Determine an author's point of view or purpose in a text and analyze how an author uses rhetoric to advance that point of view or purpose.