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Friday, October 18, 2013
“Experience is simply the name we give our mistakes.” ~ Oscar Wilde
S.C. Standards for Today: B-2: The student will demonstrate an
understanding of the structure and function of cells and their organelles.
Today’s Objectives:
• Uncontrollable Cell Division
• Cancer Mini- Research Activity
Reminder: Content Recovery must be completed by TODAY 10/18/13.
Midterm, next Thursday 10/24/13.
Warm Up:
• What is the difference between primary and secondary
succession?
• True or False: Commensalism is defined as both
species benefitting from the relationship.
Uncontrollable Cell
Division
Cell Cycle Control

Cell cycle is driven by a
chemical control system
Triggers
and coordinates
the cell cycle

Regulated at certain
checkpoints
Cell Cycle Control

2 types of signals:
Internal
signals
 Cell
senses presence of
enzymes that were produced
inside
External
 Cell
Signals
senses chemicals that
were produced outside in
other cells
Cell Cycle Control
Cells can respond to
physical signals from
their envt.
Examples:

Too
close= stop dividing
Too much space= start
division
Metaphase/
Anaphase:
Are all of
the chrom.
attatched to
the spindle?
C
G1
M
G2/M:Is all
the DNA
replicated?
Is the envt.
favorable?
Start: Is the
environment
favorable?
S
G2
What happens to the cell if it
is not ready for the next step?
The cell can wait until the environment
is favorable
 It will hold the cell at the checkpoint
until the problems are solved

 If
all of the DNA is not copied correctly, cell
cycle is held at the G2/M checkpoint until the
error is corrected
Apoptosis
Programmed cell death

Suicide
program is activated within an
animal cell
Death is mediated by intracellular enzymes
Problems that cannot be fixed and the
cell will self-destruct in for the benefit of
the entire organism
 Cells receive a change in signals

Mutagens
Latin for origin of change
 Physical or chemical agent
that changes the genetic
material
 Increases the frequency of
mutations
 Carcinogens:

 Any
agent, such as a chemical or
form of radiation that causes cancer
Cancer
Cells ignore the normal signals
that control cell division
Divide excessively
Normally: immune system realizes
that the cell is damage & destroys
it

Cancer
Abnormally: cell divides and
each daughter cell is a cancer cell
Malignant tumor: mass of cells
that invades and impairs the
functions of one or more organs
Benign tumor: Mass of cells that
remain at the original site

Mini-Cancer Research
You will work with one partner to
research different types of cancer
You will select a cancer from the
following list, based on how your
stick is pulled from the bag
You will access the file from the
website and submit via eBackpack

Name
Cancer Type
Basal Cell Carcnoma
Bladder Cancer
Intraocular Melanoma
Fibrous Histiocytoma
Appendix Cancer
Mesothelioma
Kaposi Sarcoma
Nasal Cavity and Paranasal Sinus Cancer
Wilms Tumor
Pancreatic Cancer
Esophageal Cancer
Salivary Gland Cancer
Hodgkin Lymphoma
Soft Tissue Sarcoma
Oropharyngeal Cancer
Pituitary Tumor