Transcript Greetings 7th Grade Life Scientists! - House 7

Greetings 7th Grade Life Scientists!
Table of Contents
TC1
Date
10/29
11/5
11/5
11/11
11/15
11/18
12/2
Activity
Cell Theory
Animal Cell
Plant Cell
The Microscope
How to Make a Wet Mount Slide
Plant vs. Animal Cell Lab
Sam’s Puppy
Pg. #
29-32
33-34
35-36
37
38
39-40
41
I know why a cell divides.
41
Sam’s Puppy
Describe your thinking in at least 2 complete sentences.
Cells undergo mitosis to:
1. Replace dead cells.
2. To help organism to grow.
Greetings 7th Grade Life Scientists!
Table of Contents
TC1
Date
10/29
11/5
11/5
11/11
11/15
11/18
12/2
12/2
Activity
Cell Theory
Animal Cell
Plant Cell
The Microscope
How to Make a Wet Mount Slide
Plant vs. Animal Cell Lab
Sam’s Puppy
Cell Size Lab
Pg. #
29-32
33-34
35-36
37
38
39-40
41
42-46
I know why a cell needs to divide into two separate cells.
Cell Size Lab
42
Purpose: Why does a cell need to divide into two separate cells?
Research:
Surface Area: the total area of the faces (including the
bases).
S= length of side
Surface Area (SA)= 6s2
S
Volume: the number of cubic units it takes to fill a figure.
S
S= length of side
Volume (V)= s3
S
S
Cell Membrane: a phospholipid layer that covers a cell’s
surface and acts as a barrier between the inside of the
cell and the cell’s environment.
Diffusion: the movement of particles from regions of
higher density to regions of lower density.
Why do cells use diffusion?
Osmosis: the diffusion of water through a semipermeable
membrane.
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Select INCREASE or DECREASE
Hypothesis: If I
the cube, then
the surface area of
because
.
Will the Iodine Solution diffuse
through the cube quicker or
slower?
Experiment:
Materials:
Independent Variables: 1cm3 cube of Potato, 2cm3
cube of Potato, 3cm3 cube of Potato
Controlled Variables: 100 mL beaker, 250 mL
beaker, 150 mL of tap water. 1 plastic glove, Metric
ruler, Iodine Solution, paper towels
Procedure:
1. All members of the group need to wash their hands.
2. Collect materials from the front table.
3. Verify (measure) the 3 cubes to ensure they are 1cm3, 2cm3, 3cm3.
4. Fill the 250 mL beaker with 150 mL of tap water.
5. Place all 3 cubes in the 100 mL beaker.
6. Ask your teacher to add the Iodine Solution to the beaker.
7. Allow the cubes to soak in the Iodine Solution for 10 minutes.
8. While you are waiting, calculate the SURFACE AREA, VOLUME, and SURFACE
AREA:VOLUME Ratio under “Cube Data.”
9. After 10 minutes, have ONE person put on the plastic glove and CAREFULLY remove
the 3 cubes from the Iodine Solution and place them in the 250 mL beaker.
10. Swirl the cubes in the 250 mL beaker of water to rinse off excess iodine.
11. Place cubes on the paper towel.
12. Return the beaker of Iodine Solution to the front table.
13. CAREFULLY slice each potato cube in half using the edge of the ruler.
14. Measure and record how far the Iodine Solution penetrated into each cube.
Record this information under “Diffusion of Iodine.”
15. Wash and dry ALL materials. Dispose of the potato cubes, paper towel, and glove
in the trash. Return the beakers, tray, to the front table.
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Collect Data
:
Cube Data
Cube Size
(cm)
1 cm3
2 cm3
3 cm3
Surface Area (cm2)
(length x width x 6
sides)
Volume (cm3)
(length x width x
height)
Surface Area:
Volume Ratio
Surface Area÷
Volume
Diffusion of Iodine
Depth of Diffusion
(cm)
Cube Size Measure how far the
(cm)
Iodine Solution
traveled to the inside
of the cube.
1 cm3
2 cm3
3 cm3
Time (minutes)
How long did the
cube sit in the
Iodine Solution?
Rate of Diffusion
(cm/minute)
cm÷ minutes
On the cubes below, sketch and label how far the
Iodine Solution traveled into the cube.
3 cm3
2 cm3
1 cm3
45
Analyze Data
:
Percent Volume of Cube That Received Iodine Solution
Total Volume of
Original Cube
(cm3)
“Unchanged” Cube Side
Length: Subtract depth of
diffusion (both sides)
from original cube
dimensions (cm).
Volume of unchanged
cube (the part that DID
NOT change color)
(cm3)
Percent of total volume
of cube that received
Iodine Solution (use
formula below)
1 cm3
2 cm3
3 cm3
Percent Volume of Cube
(total cube volume) –(volume of cube that has not changed color)
=
That Received Iodine
(total cube volume)
X 100
Graph the percent volume of cube that received Iodine. Predict what percentage of
volume would be covered if the cube was 0.5 cm3 and 4 cm3.
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Your conclusion should be written in PARAGRAPH form! The first sentence needs to tell
your audience what you did in your experiment. The next 8 sentences will be your
answers to the following questions. Your last sentence will be a “wrap-up” of your ideas.
Conclusion:
1. What does the potato represent?
2. Why did the diffusion of iodine into the potato cube cause the color change from white
to black?
3. If each cube represented a living cell, and the iodine solution was a substance needed
within the cell, what problem might the largest cell have?
4. Examine your data in table 2. What pattern do you notice in the relationship between
cube size and the rate of diffusion?
5. Examine your data in table 1. Describe what happens to the surface area and the
volume as the cell grows larger. What happens to the ratio between surface area and
volume as the cell grows larger?
6. According to your data, which cell was most successful at receiving the needed nutrient
(iodine solution) in the allowed time?
7. What can you say about the surface area to volume ratio that will best meet the needs
Greetings 7th Grade Life Scientists!
Table of Contents
TC1
Date
10/29
11/5
11/5
11/11
11/15
11/18
12/2
12/2
12/13
Activity
Cell Theory
Animal Cell
Plant Cell
The Microscope
How to Make a Wet Mount Slide
Plant vs. Animal Cell Lab
Sam’s Puppy
Cell Size Lab
THIEVES: Cell Cycle
Pg. #
29-32
33-34
35-36
37
38
39-40
41
42-46
47-49
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
I can read and understand my textbook.
47
THIEVES – Cell Cycle
Title – The Cell Cycle pg. 42 - 45
Headings –
(List headings for each section, red and blue.)
1.
A.
B.
C.
2.
A.
Introduction – (Summarize the intro in one sentence.)
Your body is constantly making new cells.
Every First Sentence in a Paragraph –
(Rewrite every first sentence, there are 6 paragraphs)
Vocabulary & Visuals –
Cell Cycle:
Chromosomes:
Homologus Chromosomes:
Mitosis:
Cytokinesis:
Figure 3
Figure 5
48
49
End of Chapter Questions:
Answer questions #1, #3, #6, #7 & #8, on page 45.
Summary:
Write a one-sentence summary about the chapter.
Greetings 7th Grade Life Scientists!
TC1
Table of Contents
Date
Activity
12/13 THIEVES: Cell Cycle
12/17 Stages of Mitosis
Pg. #
47-49
50
I know how a cell reproduces.
(Stages of Mitosis)
A period of growth and development.
Mitosis begins.
Takes up most of the life of a cell.
The nuclear (double) membrane disappears and
chromosomes condense into rod-like structures
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Chromosomes line up across the equator or
middle of the cell.
Homologous chromosomes pair up.
Before mitosis begins, chromosomes are copied.
Chromosomes separate and move to the ends
of the cell.
A nuclear (double) membrane forms around the
chromosomes.
Chromosomes unwind.
Mitosis is complete.
In animal cells, the cell pinches in two.
In plant cells, a cell plate forms between the two
new cells.
Greetings 7th Grade Life Scientists!
TC1
Table of Contents
Date
Activity
12/13 THIEVES: Cell Cycle
12/17 Stages of Mitosis
Pg. #
47-49
50
12/19 Mitosis Quiz
12/19 Mitosis Lab
51
52
I can observe and draw the stages of mitosis in plant cells.
Mitosis Lab
52
Procedure:
1. Locate a cell that is showing a phase of mitosis.
2. Draw one cell that is in each phase.
3. Label the following parts:
• nucleus
• nuclear membrane
• Chromosomes
Why are we observing onion root tips?
Interphase
Prophase
A period of growth and
development. Takes up most
of the life of a cell. Before
mitosis begins,
_______________ are
copied.
Mitosis begins. The
_______________ membrane
dissapears. Chromosomes
condense into rod-like structures.
Anaphase
Telophase
_______________ separate
and move to opposite ends
of the cell.
A _______________ membrane
forms around the chromosomes.
_______________ unwind.
Mitosis is complete
Metaphase
Chromosmes line up across the
_______________ of the cell.
Homologous _______________
pair up.
Cytokinesis
In animal cells, the cell
_______________ in two. In
plant cells, a cell
_______________ forms
between the 2 new cells.