Mitosis

Content Objectives:

1. I will explain the result and purpose of mitosis.
2. I can describe how a "child" cell compares to the parent cell.

Language Objectives

1. New vocabulary terms: Mitosis, Replicate, Interphase, Cytokinesis

December Process Words

• Adapt (6, 7th grade)

• Verify (6, 7th grade)

• Establish (7th grade)

• Relate (7th grade)

Mitosis Video

1. Viewing #1: Without sound - what do you think about? What questions do you have?
2. Viewing #2: Sound - What are new vocabulary terms? What questions do you have?

Notes on mitosis

Mitosis Flip Books

Support Reading p. 80-85 in the Cells and Heredity Book

Extra Animation: Build a Mitosis Movie

Exit Note:
1. In mitosis, a "parent cell" divides into two daughter cells. How do these cells compare to the parent?
2. Why do cells in your body undergo mitosis?

On Friday, progress reports will be sent home. Please use the progress report to update the tracking sheet provided today. A reassessment will take place on Monday that covers photosynthesis, cellular respiration and passive transport.

Also on Monday, please bring in your completed flip book.

Cycles

At the end of last class, several students had not finished the assessment. Extra time will be provided at the beginning of class today to finish.

Check out the egg from last class. What will happen if we now put it into syrup?

What does the word "cycle" make you think?
Spend some time drawing with the word "cycle" in your mind.


Content Objectives:

1. Describe what is meant by the term cycle and provide various examples.
2. Explain key functions reasons of cell division

December Process Words

• Adapt (6, 7th grade)
• Verify (6, 7th grade)
• Establish (7th grade)
• Relate (7th grade)

After this short video clip, you will spend some time writing about what you thought as you watched it.

Reading: p. 73 - 78

Vocabulary: 

• DNA
• Chromosome
• Growth
• Development
• Repair

How is cell division related to the growth, development and repair of a cell?

Diffusion

What happened to your bag of cornstarch? What happened to the iodine?

Today, we will return to the investigation from last class and continue with more investigation into transport processes in cells.

Content Objectives:

1. Describe the difference between passive and active transport.
2. Describe the process of diffusion.
3. Review photosynthesis & cellular respiration

November Process Words

• Adapt (6, 7th grade)
• Verify (6, 7th grade)
• Establish (7th grade)
• Relate (7th grade)

Stations! There are many activities to do today. In groups of 3, you will rotate to stations. The handout provides instructions.

Review for Friday's Assessment
Cells & Heredity:
p. 67 (5-10, 13-14, 16-18)
p. 68 (25-28, 30-31)

Diffusion Lab

Today, we will begin investigating processes that take place inside cells. While we are not able to see cells, we will use models to represent these processes.

Content Objectives:

1. Describe the process of diffusion when using starch and iodine.

Language Objectives

1. Become familiar with new vocabulary terms.

November Process Words

• Adapt (6, 7th grade)
• Verify (6, 7th grade)
• Establish (7th grade)
• Relate (7th grade)

Introduction: In this lab you will observe the diffusion of a substance across a semipermeable membrane. Iodine is a known indicator for starch. An indicator is a substance that changes color in the presence of the substance it indicates.

Vocabulary
Solution - a homogeneous mixture of two or more substances; a mixture of a solvent and a solute.
Solute - a substance that is dissolved in another substance, forming a solution.
Solvent - a substance that dissolves other substances, forming a solution.
Diffusion - the movement of a substance from an area of high concentration to an area of low concentration.  The process tends to distribute the particles more evenly.
Osmosis – the diffusion of water through a selectively permeable membrane
Selectively permeable -a barrier that allows some chemicals to pass but not others
Hypotonic - the solution on one side of a membrane where the solute concentration is less than on the other side.
Hypertonic - the solution on one side of a membrane where the solute concentration is greater than on the other side.



Prelab Observations: Describe what happens when iodine comes into contact with starch.



Procedure:

1. Fill a plastic baggie with a teaspoon of corn starch and about 100 ml of water. Tie bag.
2. Fill a beaker halfway with water and add 15 drops of iodine.
3. Place the baggie in the cup so that the cornstarch mixture is submerged in the iodine water mixture.
4. Wait until time and record your observations in the data table
5. While you are waiting, answer the questions.

Questions:
1. Define diffusion.


2. Define osmosis


3. What is the main difference between osmosis and diffusion


4. Why is iodine called an indicator?


5. Molecules tend to move from areas of _______ concentration to areas of ______ concentration.


What's in the Bag?
We're going to think about concentrations. Which substances are more or less concentrated depends on which one has the most stuff in it.

1. Is the baggie or beaker more concentrated in starch?
2. Is the baggie or beaker more concentrated in iodine?
3. Iodine solution: is the baggie or the beaker hypertonic?
4. Starch solution: is the baggie or the beaker hypertonic?
5. Which one is hypotonic in relation to starch: baggie or beaker?

Make Some Predictions

1. If the baggie was permeable to starch, which way would the starch move? (into the bag / out of the bag)
2. If the baggie was permeable to iodine, which way would the iodine move? (into the bag / out of the bag)
3. If the baggie was permeable to iodine, what color would you expect the solution in the baggie to turn? _______ What about the solution in the beaker? ___________
4. If the baggie was permeable to starch, what color would you expect the solution in the baggie to turn? ________ What about the solution in the beaker? _________
5. Make a prediction about what you think will happen:

Data Table

	Starting Color	Color after 15 minutes
Solution in Beaker
Solution in Bag

Post Lab Analysis
1. Based on your observations, which substance moved, the iodine or the starch? ____________________
2. How did you determine this?

3. The plastic baggie was permeable to which substance?

4. Is the plastic baggie selectively permeable? Please describe why / why not.


5. Sketch the cup and baggie in the space below. Use arrows to illustrate how diffusion occurred in this lab.





6. What would happen if you did an experiment in which the iodine solution was placed in the baggie, and the starch solution was in the beaker? Be detailed in your description.


7. Why is it not a good idea to store iodine in a plastic bag?

Lab modified from the Biology Corner

For homework, please do the following:

1. Read pages 56-61 in the Cells and Heredity book.
2. Complete the lab questions.