5.1 The Cell Cycle

First Five 2/1

1. Based on your current knowledge:a. Why do we always have to cut our hair, our

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?

Schedule1.First Five2.Cell Cycle Educreation

HW: Cornell Notes 5.1 and 5.2 – Due Wed.

5.1 The Cell Cycle

Cell Cycle Educreations (Chapter 5, Section 1)

1.Must includea. Stages of the cycleb. What happens in all the stagesc. Picture showing what is happening in each stage

5.1 The Cell Cycle

First Five 1/271. 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?

Schedule1.First Five2.Cell Cycle Notes3.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

• Mitosis occurs only if the cell is large enough and the DNA undamaged.

– 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)

5.1 The Cell Cycle

Videos• 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

GQ: How does the structure of DNA relate to its function?

Schedule1.First Five2.Cycle quiz 3.DNA4.Wrap up

HW: Study Guide 5.1 and 5.2 – due Today

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.