BIOLOGY
UNIT 6 OBJECTIVES: GROWTH
Name____________________
Date__________ Period_____
1. Explain how cancer is an example of uncontrolled cell division.
2. Distinguish between a healthy cell and an abnormal or cancerous cell.
3. Describe DNA replication
 When
 Where
 How
 Why
4. Describe the major events in the cell cycle.
a. Interphase
b. Cell Division
5. Compare the relative amount of time for interphase and cell division to occur.
6. Order and describe the four major events of mitosis.
7. Describe the outcome of mitotic cell division.
 Nuclear division (mitosis)
 Cytoplasmic division (cytokinesis)
8. Describe how cell division benefits survival of organisms.
9. Explain why cells must be small in order to survive and function properly.
Essential Vocabulary
Essential Cell Parts
Surface Area to Volume Ratio
Cell Division
Mitosis
Interphase
Cytokinesis
Cell Cycle
Nucleus
Nuclear Membrane
Chromosome
Replication
Nucleus
Cytoplasm
Nuclear membrane
Cell Membrane
Other organelles
BIOLOGY – Unit 6 Notes
Name:________________
Cell Size Notes
Although organisms are very different, the size of their cells is very similar.
Most cells are very small, between _____________ and ____________.
There are two main reasons for cells to stay small:
1. Nucleus/DNA


2. Size of cell membrane


As cell ________________in size, the need for materials as well as the
waste production _____________—so surface area of the cell membrane
must ___________ in order to bring in enough ___________and rid the
cell of its __________.

As the cell gets_____________, though, the _______________ (of the
cell membranes) to ____________ (of the cell) ratio gets____________.

So…if a cell is___________, it has a better chance of ___________
enough materials to support its cytoplasm.
How Does Cell Division Benefit Organisms?
Growth –
 Multicellular organisms grow (get bigger/increase in size)
because of an ___________ in the number of _______
Repair/Maintenance  Repair –
In multicellular organisms, injuries can be mended by
___________new cells.
 Maintenance -
Reproduction of single-celled organisms
 _______ organisms are made by ___________
Keep Cells Small
 Maintain a ________ surface area to volume ratio for material
exchange
Unit 6 Biology Notes
DNA Replication
Objective 3: Describe DNA replication (When, Where, How, Why)
1. When does DNA replicate?
2. Where does DNA replicate?
3. How does DNA replicate?
1.
2.
3.
4. Why does DNA replicate?
Cell Cycle
Objective 4: Describe the major events in the cell cycle.
a. Interphase
b. Cell Division
Objective 5: Compare the relative amount of time for interphase & cell division to occur.
Objective 6: Order the four major events of mitosis.
Objective 7: Describe the outcome of mitotic cell division.
 Nuclear division (mitosis)
 Cytoplasmic division (cytokinesis)
There are two main parts to this cycle:
1. Interphase
2. Cell Division
1. Interphase
*Once a cell copies its DNA, it usually completes the rest of the cell cycle.
2. Cell Division
a. Nuclear Division (_____________):
b. Cytoplasmic Division (________________):