5.1 The Cell Cycle
First Five 2/1
Schedule
1.First Five
2.Cell Cycle Educreation
1. Based on your current
knowledge:
a. Why do we always
HW: Cornell Notes 5.1 and 5.2 –
have to cut our hair, our
Due Wed.
fingernails, and the lawn?
b. Why are cells small?
2. Check Quarter 2 grades,
hang Posters, and pick up
work.
GQ: How do cells live?
5.1 The Cell Cycle
Cell Cycle Educreations
(Chapter 5, Section 1)
1.Must include
a. Stages of the cycle
b. What happens in all the
stages
c. Picture showing what is
happening in each stage
5.1 The Cell Cycle
First Five 1/27
1. Without using your
educreation, write down
as many stages of the cell
cycle you can remember.
2. Make sure you have
Socrative for students
downloaded on your iPad.
GQ: How do cells live?
Schedule
1.First Five
2.Cell Cycle Notes
3.Cell Cycle Quiz
HW: Study Guide 5.1 and
5.2 – Due Tomorrow
5.1 The Cell Cycle
KEY CONCEPT
Cells have distinct phases of growth, reproduction,
and normal functions.
5.1 The Cell Cycle
The cell cycle has four main stages.
• The cell cycle is a regular pattern of growth, DNA
replication, and cell division.
5.1 The Cell Cycle
• The main stages of the cell cycle are gap 1, synthesis, gap
2, and mitosis.
– Gap 1 (G1): cell growth and
normal functions
– DNA synthesis (S): copies
DNA
– Gap 2 (G2): additional
growth
– Mitosis (M): includes
division of the cell nucleus
(mitosis) and division of the
cell cytoplasm (cytokinesis)
• Mitosis occurs only if the cell is large enough and the DNA
undamaged.
5.1 The Cell Cycle
Videos
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•
•
•
•
•
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http://www.youtube.com/watch?v=7P4IakYQ6V0
http://www.youtube.com/watch?v=efyV-YxV0P0
http://www.youtube.com/watch?v=1EB8q9aR8Hk
http://www.youtube.com/watch?v=4A4LqsPau28
http://www.youtube.com/watch?v=65SODTL_QsA
http://www.youtube.com/watch?v=gjZHOWaRSpk
http://www.youtube.com/watch?v=jQf4T_cBA3c
5.1 The Cell Cycle
Cells divide at different rates.
• The rate of cell division varies with the need for those
types of cells.
• Some cells are unlikely to divide (G0).
5.1 The Cell Cycle
Cell size is limited.
• Volume increases faster than surface area.
5.1 The Cell Cycle
• Surface area must allow for adequate
exchange of materials.
– Cell growth is coordinated with
division.
– Cells that must be large have
unique shapes.
5.1 The Cell Cycle
Doubling and Division
• If we want two batches of cookies, not just
one, what do we need to do to the recipe?
5.1 The Cell Cycle
First Five 1/28
1. What happens in the
S phase of the cell
cycle?
2. Write down
everything you know
about DNA.
3. Turn in your Study
Guide Sec. 5.1 and
5.2 to the TA desk
Schedule
1.First Five
2.Cycle quiz
3.DNA
4.Wrap up
HW: Study Guide 5.1
and 5.2 – due Today
GQ: How does the structure of DNA relate to
its function?
5.1 The Cell Cycle
Doubling and Division
• For a cell to be functional after division, what needs to be
present?
•
•
•
•
•
Complete set of DNA
Organelles
Cytoplasm
Cell Membrane
Cell wall (if it is a plant cell)
5.1 The Cell Cycle
Immortal Cells
• How do scientists define immortal?
• What can you infer (guess) about how cell
division in a normal cell compares to cell
division in a cancer cell?
5.1 The Cell Cycle
Do Now
• Why do cells have to double their organelles, cytoplasm,
and DNA?
5.1 The Cell Cycle
Review
• During which stage of the cell cycle is the DNA copied?
• What limits the maximum size of a cell
• Suppose you treat cells with chemicals that block
cytokinesis, describe what you think the cells will look
like.