11/16 & 11/17 - 7 th grade agenda collect hw: reading & note taking p.75 - 78 cell division...
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11/16 & 11/17 - 7th Grade Agenda
Collect HW: Reading & Note Taking p.75 - 78Cell DivisionBrain Pop Cell DivisionCell Cycle QuizMicroviewer Lab (Cell Structures)Class Reading p.133-136HW: Reading & Note Taking p.79 – 80
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Reflection
• Prompt: What is the Cell Cycle and name 2 phases in the Cell Cycle.
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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/mitosis%20movie.htm
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Cell Cycle
Interphase Prophase
Metaphase
AnaphaseTelophase
Cytokinesis
??
?
??
?
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Interphase
• Stage 1: Interphase: Period before cell division occurs. – Cell is doing its J___
while growing (doubles in size)
– Replicates (make a copy) its DNA
ob
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Mitosis : Prophase
Prophase:Identical Chromatids p______. They are held together by a centromere
air up
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Mitosis : Metaphase
Metaphase: Chromosomes line up in the m______iddle
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Mitosis : AnaphaseAnaphase: The centromeres split and the chromosomes are pulled a______part
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Mitosis: TelophaseTelophase:Each set of chromosomes are F___ away and a nucleus forms around them
ar
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CytokinesisCytokinesis
The cell membrane m______ inwards then pinches in two. This form 2 identical cells
oves
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DNA – Deoxyribonucleic Acid
• Nitrogen Based Molecules (4 Letters of DNA Alphabet)
• A pairs up with ____• G pairs up with ____
TC
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Cell Cycle
• Stage 1: Interphase: Period before cell division occurs.
–Cell doubles in size
–Copy the DNA in its nucleus
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Cell Cycle
• Stage 2: Mitosis
–One copy of the DNA is distributed into each of the two daughter cells
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Cell Cycle
• Stage 3: Cytokinesis
–Cytoplasm divides
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Cell Cycle Facts
• Some cells divides every 2 hours or less
• Human Liver cells divides every 22 hours
• There are about _____ million cells dividing in your body right now!!
• Most cells divide but human b_____ cells never divide.
100
rain
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Cell Cycle Facts• Some cells divides
every 2 hours or less• Human Liver cells
divides every 22 hours
• There are about 100 million cells dividing in your body right now!!
• Most cells divide but human brain cells never divide.
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Chromosomes
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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
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Cancer
• What is Cancer
Mutation: Damage to the DNA
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Cancer
• Cancer begins when mu________ disrupt the normal cell cycle causing cells to di_________ in an uncontrolled way
• Eventually a tu______ (a mass of abnormal cells) forms.
tation
vide
mor
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How Cancer Spreads
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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.
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Cancer Prevention
• 2/3 of all cancer deaths are caused by tobacco use or unhealthful diets
• Smoking is the main cause of lung cancer
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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.
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Cell Cycle Quiz: Groups of 3 studentsp.132 & 133
Front of the card Back of the card
Name of the Phase: Mitosis: Prophase
Summary of the Phase:
Spindle Fiber, Centromere & Chromatids form.
1. Each student will create 2 cards2. The group will combine their cards to complete the
cell cycle3. Students in each group will quiz each other with their
flash cards4. Apprentices will come around and quiz and grade each
of the group