11/19 & 11/20 - 7th Grade Agenda
Learning Objective: Learn about Cancer & Stem Cells
Collect HW: Reading & Note Taking p.79 – 80
Brainpop: Stem Cells & Specializations & Cancer,
Mitosis
Chap 4 Study Guide
Video: Test your brain
Class Reading p.135-141
HW: Reading & Note Taking p.81 – 84
Reminder: Planetary Scientist visiting 11/20 1st Period.
Reminder: Chap 4 Test on 11/27 & 11/28
Reflection
• Prompt: Copy the drawing of the Cell
Cycle on p. 132 – 133. Label each phase.
Reflection
• Prompt: Write 3 facts that you learned
watching the Brain pop video.
Mitosis Animations & Movie
• http://www.cellsalive.com/mitosis.htm
• http://www.cellsalive.com/cell_cycle.htm
• http://www.pbs.org/wgbh/nova/baby/divide.
html#
• http://www.contexo.info/DNA_Basics/mitos
is%20movie.htm
Cell Cycle
?
Interphase
Prophase
?
?
Cytokinesis
Metaphase
Telophase
?
?
Anaphase
?
Interphase
• Stage 1: Interphase:
Period before cell
division occurs.
– Cell is doing its J___
ob
while growing (doubles
in size)
– Replicates (make a
copy) its DNA
Mitosis : Prophase
Prophase:
Identical Chromatids
air up They are
p______.
held together by a
centromere
Mitosis : Metaphase
Metaphase:
Chromosomes line
up in the m______
iddle
Mitosis : Anaphase
Anaphase: The
centromeres split
and the
chromosomes are
pulled a______
part
Mitosis: Telophase
Telophase:
Each set of
chromosomes
ar away
are F___
and a nucleus
forms around
them
Cytokinesis
Cytokinesis
The cell membrane
m______
oves inwards then
pinches in two. This
form 2 identical cells
DNA – Deoxyribonucleic Acid
• Nitrogen Based
Molecules (4 Letters
of DNA Alphabet)
T
• A pairs up with ____
C
• G pairs up with ____
Cell Cycle
• Stage 1: Interphase:
Period before cell
division occurs.
–Cell doubles in
size
–Copy the DNA in
its nucleus
Cell Cycle
• Stage 2: Mitosis
–One copy of
the DNA is
distributed into
each of the two
daughter cells
Cell Cycle
• Stage 3: Cytokinesis
–Cytoplasm divides
Cell Cycle Facts
• Some cells divide every 2 hours or less
• Human Liver cells divide every 22 hours
• There are about 100
_____ million cells
dividing in your body right now!!
rain cells
• Most cells divide but human b_____
never divide.
Cell Cycle Facts
• Some cells divide
every 2 hours or less
• Human Liver cells
divide every 22
hours
• There are about 100
million cells dividing
in your body right
now!!
• Most cells divide but
human brain cells
never divide.
Chromosomes
DNA Replication
• DNA looks like a spiral
staircase “double helix”
• Two sides of DNA ladder
are made up of sugar
called deoxyribose and
Phosphate
• Adenine always pairs with
Thymine
• Cytosine always pairs
with Guanine
Cancer
• What is Cancer
Mutation:
Damage to the
DNA
Cancer
• Cancer begins when mu________
tation
disrupt the normal cell cycle causing
cells to di_________
in an
vide
uncontrolled way
mor (a mass of
• Eventually a tu______
abnormal cells) forms.
How Cancer Spreads
Treating Cancer
• Surgery: Only
effective during early
stages
• Radiation: Radiation
also destroy healthy
cells
• Chemotherapy: Uses
of drugs to kill cancer
cells. Side effect:
Also kills healthy
cells.
Cancer Prevention
• 2/3 of all cancer
deaths are caused by
tobacco use or
unhealthful diets
• Smoking is the main
cause of lung cancer
Cancer Prevention
• Diet high in fat (fatty
meats, fried foods) is
harmful
• Diet that includes a lot
of fruits, vegetables
and grain products
can lower some type
of cancer.
Differentiation
• As cells
differentiate, they
become diff_____
errent
from one another.
Stem Cells
• Stem Cells
respond to
specific needs
in the body by
becoming a
iali
spec____zed
ce___
ll