Unit 1: Cells



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. |p. 68 |

|a) The cell membrane separates the inside of the cell from the environment. |p. 85-86 |

|The cell membrane controls what enters and leaves the cell in order to maintain HOMEOSTASIS. | |

|Homeostasis is the biological balance, which cells must maintain for survival. |Notes |

|Be able to explain why the cell membrane is made of a phospholipid bilayer. | |

|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”. | |

|When energy is required to move particles through protein gates, this is called active transport. | |

| | |

|Explain interactions between cells and their environment in terms of Passive Transport. | |

|Diffusion is the movement of very small particles from an area of higher concentration to an area of lower | |

|concentration, with the concentration gradient. | |

|Osmosis is the movement of water through a semi-permeable membrane from an area of high water concentration to an area |p.84-87 |

|of lower water concentration, with the concentration gradient. | |

|In our respiratory and circulatory systems, oxygen diffuses into our blood and carbon dioxide diffuses out of our |Notes |

|blood. | |

|Active Transport | |

|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…..( | |

|3. Cellular Energy : Photosynthesis (Plants only). | |

|Describe the process of photosynthesis in terms of raw materials and products generated. | |

|During photosynthesis, in chloroplasts, plant cells use sunlight, carbon dioxide and water to produce energy-rich |p.88 |

|organic molecules and oxygen. | |

|Describe that chlorophyll is a chemical in chloroplasts that can absorb or trap light energy. |Notes |

|Explain how organisms utilize the energy stored from the products of photosynthesis. | |

|Relate the importance of photosynthesis to the role of producers as the foundation of food webs. | |

|Know this equation…… | |

|4. Cellular Energy: Respiration (Plants & Animal Cells) | |

|Respiration occurs in the mitochondria and involves the breakdown of organic molecules (C6H12O6) to release energy. | |

|The energy released during respiration is transported within the cell in the form of ATP. | |

|During cell respiration, in mitochondria, both animal and plant cells burn organic molecules with oxygen to produce | |

|energy, carbon dioxide and water. | |

| |p. 89 |

|Aerobic Respiration | |

|Anaerobic Respiration | |

| |p. 91 |

|Requires Oxygen | |

|A.K.A. Cellular Respiration |Notes |

|Produces 36 ATP’s | |

|Waste Products CO2 + H2O | |

|Does Not Require Oxygen | |

|A.K.A Fermentation | |

|Produces 2 ATP’s | |

|Waste product examples: | |

|-Lactic Acid | |

|-Alcohol | |

| | |

| | |

|d) Know this equation……. | |

| | |

|Explain how photosynthesis and respiration are complementary processes for cycling carbon dioxide and oxygen in an | |

|ecosystem. | |

|State that respiration occurs in the mitochondria and involves the breakdown of organic molecules to release energy | |

|stored by photosynthesis. | |

|Understand that PLANT use both Photosynthesis (obtain food) & Respiration (obtain energy). | |

|The product of Photosynthesis becomes the reactants in Respiration and the products of Respiration become the reactants|p. 90 |

|in Photosynthesis. It is a cycle between the two organelles. | |

|Do you Notice anything about | |

|these two equations? | |

| | |

| | |

| | |

| | |

| | |

Labs:

1. Egg Lab: In a FORMAL LAB FORMAT!!

a. Identify: variables, constants & controls, write a hypothesis and a step procedure.

b. Do the experiment, recording observations.

c. Write that includes: a description of your findings, a conclusion related to your hypothesis and a discussion of possible sources of error.

d. Typed or in Black Ink (neat)

Assessments:

1. QUIZ on Cell Membrane & Exchange /

2. QUIZ on Photosynthesis & Respiration

3. Test: Covering the 4 Essential Concepts

4. 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

-----------------------

[pic]

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download