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This unit focuses on transport across the cell membrane to maintain homeostasis. Students investigate homeostasis and transport of molecules in order to explain the cellular processes. Students compare the roles of different biomolecules in the cellular processes investigated during this unit. Students investigate the role of enzymes in the context of maintaining homeostasis.
ASSIGNMENT: Watch the video on the naked egg and osmosis lab. We will be doing this lab, so I want you to watch the video as a preview to our investigation. Be prepared to tell me the purpose of the investigation.
ASSIGNMENT:
1. Watch the video and play with the interactive from the link on the right side of the screen.
2. Write 3-5 complete sentences about how the cell membrane works.
1. See me for a copy of the cell membrane model pieces.
2. Cut the pieces out.
3. Use the videos you've watched, with internet/book resources to label and assemble the pieces of the membrane I've given you. Have me check them BEFORE you glue them down on construction paper.
4. Label one side of the membrane "inside the cell" on your construction paper, and label the other side "outside the cell".
5. Once you've glued down your membrane, see me.
ASSIGNMENT: Select one (or both) of the videos above on passive vs. active transport in cells.
1. See me for a cell transport graphic organizer OR Create a double-bubble map comparing and contrasting the two primary kinds of cell transport (Active Transport and Passive Transport). Be sure to include examples of each and the difference in energy between them. Your maps should include the following terms:
- osmosis
- passive transport
- active transport
- energy/ATP
- water
- hypotonic
- hypertonic
- protein pump
- protein channel
- concentration gradient
- semi-permeable
- endocytosis
- exocytosis
- High to low concentration
- Facilitated diffusion
- Low to high concentration
ASSIGNMENT:
1. Complete the virtual lab above. Note what happens in the different types of solutions.
2. Write a 3-5 sentence summary about how cells maintain homeostasis using osmosis, a passive form of transport.
ASSIGMENT:
1) Complete a lab write-up for your osmosis egg lab.
2) Include:
- one sentence stating the PURPOSE of the lab
- at least 3 sentences describing the PROCEDURE of the lab
- a DATA TABLE using a ruler
- a GRAPH of your data, using a ruler (Suggested graph type = bar graph)
- at least 2 sentences SUMMARIZING your lab results and observations, using your data to support your summary
PAP- this should be TYPED, and the solutions used should be identified as either hypotonic or hypertonic. We didn't use an isotonic solution. In your conclusion, identify evidence that no isotonic solution was used.
You are ready for your unit test! Done early? Create a model of an enzyme/substrate complex using materials from the front of the classroom.
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