UNIT 3:
Cell Membrane,
Photosynthesis and Respiration
Test Date: ______
Essential Concepts and Skills / Reading- Describe the structure and function of the cell membrane, and explain how substances get into and out of cells.
b)The cell membrane controls what enters and leaves the cell in order to maintain HOMEOSTASIS.
c)Homeostasis is the biological balance, which cells must maintain for survival.
d)Be able to explain why the cell membrane is made of a phospholipid bilayer.
e)Very small molecules, like water, can pass directly through the cell membrane, this, is called passive transport. While large molecules, like sugar, must pass through “protein gates”.
f)When energy is required to move particles through protein gates, this is called active transport. / p. 68
p. 85-86
Notes
- Explain interactions between cells and their environment in terms of Passive Transport.
b)Osmosis is the movement of water through a semi-permeable membrane from an area of high water concentration to an area of lower water concentration, with the concentration gradient.
c)In our respiratory and circulatory systems, oxygen diffuses into our blood and carbon dioxide diffuses out of our blood.
Active Transport
a)Requires the cell to use energy to move particles in or out.
-Move particles against the gradient.
-Particles to large to enter membrane – Endocytosis
-Particles to small to leave cell membrane – Exocytosis
Hint Vesicle is the same as a vacuole….. / p.84-87
Notes
3. Cellular Energy : Photosynthesis (Plants only).
a)Describe the process of photosynthesis in terms of raw materials and products generated.
b)During photosynthesis, in chloroplasts, plant cells use sunlight, carbon dioxide and water to produce energy-rich organic molecules and oxygen.
c)Describe that chlorophyll is a chemical in chloroplasts that can absorb or trap light energy.
d)Explain how organisms utilize the energy stored from the products of photosynthesis.
e)Relate the importance of photosynthesis to the role of producers as the foundation of food webs.
f)Know this equation…… / p.88
Notes
4. Cellular Energy: Respiration (Plants & Animal Cells)
a)Respiration occurs in the mitochondria and involves the breakdown of organic molecules (C6H12O6) to release energy.
b)The energy released during respiration is transported within the cell in the form of ATP.
c)During cell respiration, in mitochondria, both animal and plant cells burn organic molecules with oxygen to produce energy, carbon dioxide and water.
Aerobic Respiration / Anaerobic Respiration
- Requires Oxygen
- A.K.A. Cellular Respiration
- Produces 36 ATP’s
- Waste Products CO2 + H2O
- Does Not Require Oxygen
- A.K.A Fermentation
- Produces 2 ATP’s
- Waste product examples:
-Alcohol
d) Know this equation……. / p. 89
p. 91
Notes
- Explain how photosynthesis and respiration are complementary processes for cycling carbon dioxide and oxygen in an ecosystem.
b)Understand that PLANT use both Photosynthesis (obtain food) & Respiration (obtain energy).
c)The product of Photosynthesis becomes the reactants in Respiration and the products of Respiration become the reactants in Photosynthesis. It is a cycle between the two organelles.
d)Do you Notice anything about
these two equations?
/ p. 90
Mercer Middle
Loudoun County Public Schools
Aldie, VA
Labs:
- Egg Lab: In a FORMAL LAB FORMAT!!
- Identify: variables, constants & controls, write a hypothesis and a step procedure.
- Do the experiment, recording observations.
- Write that includes: a description of your findings, a conclusion related to your hypothesis and a discussion of possible sources of error.
- Typed or in Black Ink (neat)
Assessments:
- QUIZ on Cell Membrane & Exchange /
- QUIZ on Photosynthesis & Respiration
- Test: Covering the 4 Essential Concepts
- Honors Essay Question: Can a snail and a piece of Elodea support each other in a closed container?
- Be sure to discuss energy flow and matter cycling in your answer
Mercer Middle
Loudoun County Public Schools
Aldie, VA
Mercer Middle
Loudoun County Public Schools
Aldie, VA