3Why do you think cells need to divide? Cell Growth & DivisionWhy do you think cells need to divide?
4Cells divide for three reasons… 1. Growth of organismDNA cannot function in a large cell.Materials cannot be transported through the cell fast enough.2. Repair of tissues3. Reproduction
5Consequences of Large Cells 1. SA:V ratio gets smaller; things cannot get in and out of the cell quick enough.2.Large animals do not have large cells.
6Figure 4.2 Why Cells Are Small (Part 1) l x w x 6l x w x h
7Cell Cycle Interphase (longest part of the cell cycle) Interphase includes all the time that the cell is not dividing.G1 (Growth 1)S (Synthesis) - DNA copiesG2 (Growth 2) - cell prepares for divisionMitosis-nucleus dividesCytokinesis-cell divides
8Reading , Math & Science Egg Donation News Feature Why We Should Exercise
9Assignment- Exit SlipCalculate the surface area to volume ratio for a cuboidal cell with 1.5cm, 2.5cm, 4cm, and 10cm.Predict what problems a 10cm cell would have vs. a 1.5 cm cell would have.
10Assignment- Exit SlipRead 10.1 and 10.2 complete all section questions. p240Calculate the surface area to volume ratio for a cuboidal cell with 1.5cm, 2.5cm, 4cm, and 10cm.Predict what problems a 10cm cell would have vs. a 1.5 cm cell would have.Rd. 253, answer the following:Explain why scientists are interested in SC when your body can replicate its own cells.Propose another alternative to SCR relating to cell division.List two ways researchers can use stem cells to help people.
12Anticipatory Set___ Which of the following is a requirement for all active transport processes?A. ADPB. ATPC. AFPD. AQP
13Analyze the diagram above, what process is taking place, and what type of cell transport process is this?A. phagocytosis, passive transportB. phagocytosis, active transportC. receptor mediated endocytosis, passivetransportD. exocytosis, active transport
14Using the diagram, the process that will occur following the process shown in the diagram to expel any unneeded contents would most likely be? (B.1.g, DOK2)A. endocytosisB. pinocytosisC. exocytosisD. phagocytosis
15Read and List 2 reasons the nucleus divides. Mitosis is the process of nuclear division. The cell divides because the DNA would not be able to code for all the traits necessary of a large cell, and because substances can not enter and exit a cell fast enoughmitosis animationmitosis songHow cancer works
16Interphase The longest period of the cell cycle. DNA duplicates during this phase.Centrioles divide.Centrioles are a type of cytoskeleton that is only visible when the cell is dividing. Otherwise they are incognito.
17After interphase mitosis begins What is dividing in mitosis?
18Prophase Step 1 of mitosis Centrioles separate. Spindle fibers form. Nucleus disappears.Chromosomes tighten up and prepare to move.
19Metaphase Step 2 of mitosis Chromosomes line up in the center of the cell.Chromosomes connect to spindle fibers at their centromere.
20Anaphase Step 3 of mitosis Chromosomes are pulled by the spindle fibers to opposite ends of the cell.
21TelophaseStep 4 of mitosisChromosomes separate.Two nuclei reform
22Cytokinesis Following mitosis, cytokinesis occurs. Cytoplasm pinches in half and two identical daughter cells result.In plant cells a cell plate will formMitosis Greenday Song
29Metaphase Interphase Prophase Anaphase Telophase List the 6 stages of the cell cycle, and circle the stages that include mitosis.AnaphaseTelophase
30Review of the Cell Cycle 1.Interphase2. Prophase3. Metaphase4. Anaphase5. Telophase6. CytokinesisMitosis Animation I- Cells AliveMitosis Animation II-Higher EdMitosis Animation III-Hybrid Medical
3111-27-11 1. What three reasons cause the cell to divide? Calculate the change of concentration of hydrogen in a pH of 2 to a pH of 5.Calculate SA:V ratio for a cube cell with a length of 5nm.WRITE THESE QUESTIONS AND ANSWERS DOWN FOR A GRADE.
32CREATE THIS BY END OF CLASS! Use two colors of paper to complete the following:Diagram and label the 6 stages of the cell cycle (one color for interphase and cytokinesis, one color for 4 stages of mitosisDescribe what is happening in each stage.Use the yarn to make spindle fibers and colored paper to make chromosomes.Must have 3 chromosomes per diagram.
33Mitosis Math What is the longest phase of the cell cycle? What % of the cell’s life does it comprise?What is the shortest phase of the cell cycle?
37Cancer The inability of cells to regulate cell division. Cancer = uncontrolled cell division.Tumors = result in masses of cells that have uncontrollably divided.Many factors such as tobacco, radiation, and some viruses may lead to the breakdown of cell division regulation.
40Calculate the following: Show equation Below are given the length of a cell’s life. Calculate the amount of time it spends in Interphase and mitosis.1. 9 days months2. 4 hours minutes3. 16 days months4. 2 years years5. 5 minutes days6. 17 hours months7. 40 months years8. 18 days
44Mitosis vs. Meiosis MEIOSIS MITOSIS Sex cell division Start with a full set of chromosomes from mom and dad (diploid=2n), end with only half the starting number (haploid=n)Sex cells can only have _______ a set of chromosomes because they will fuse and form ________. ½ + ½ = 1Somatic cell divisionStart with a full set of chromosomes from mom and dad (diploid=2n), end with a diploid.
45Meiosis Animation-Cells Alive Meiosis Animation II
46Exit SlipDraw the process of meiosis as shown on page 276, and give a brief description of each phase.