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

Reflection

• Prompt: What is the Cell Cycle and name 2 phases in the Cell Cycle.

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

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

Mitosis : Prophase

Prophase:Identical Chromatids p______. They are held together by a centromere

air up

Mitosis : Metaphase

Metaphase: Chromosomes line up in the m______iddle

Mitosis : AnaphaseAnaphase: The centromeres split and the chromosomes are pulled a______part

Mitosis: TelophaseTelophase:Each set of chromosomes are F___ away and a nucleus forms around them

ar

CytokinesisCytokinesis

The cell membrane m______ inwards then pinches in two. This form 2 identical cells

oves

DNA – Deoxyribonucleic Acid

• Nitrogen Based Molecules (4 Letters of DNA Alphabet)

• A pairs up with ____• G pairs up with ____

TC

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 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

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.

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________ 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

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.

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