It would take twice the amount of time.

Do Now Materials move through cells by diffusion. Oxygen and food move into cells, while waste products move out of cells. How does the size of a cell affect how efficiently materials get to all parts of a cell? On a sheet of paper, make a drawing of a large cell , then make a drawing of a cell (1/2) half the size. 2. Compare your drawings. How much longer do you think it would taketo get from the cell membrane to the center of the big cell than from the cell membrane to the center of the smaller cell? 3.What is the advantage of cells being small? It would take twice the amount of time. If cells are small, materials can be distributed to all parts of the cell quickly.

BIGGER CELLS NEED MORE FOOD and OXYGEN, but CAN’T TRANSPORT IT FAST ENOUGH or IN BIG ENOUGH QUANTITIES! http://www.animationlibrary.com

Image from: http://www.bcps.org/offices/lis/models/life/images/grow.JPG Image by Riedell CELL GROWTH & DIVISION 10-1 & 10-2

Image from: http://www.bcps.org/offices/lis/models/life/images/grow.JPG Image by Riedell Multicellular organisms grow mainly by increasing cell number

DNA CAN BE: CHROMATIN SPREAD OUT INNON-DIVIDING CELLS CHROMOSOMES SCRUNCHED UP IN DIVIDINGCELLS

Chromosome structure • CHOMOTIDS 2 identical arms • CENTROMERE constricted area holds chromatidstogether

HOMOLOGOUS CHROMOSOMES • SAME SIZE • SAME SHAPE • CARRY GENES for the SAME TRAITS http://arnica.csustan.edu/biol3020/cell_division/cell_division.htm http://sps.k12.ar.us/massengale/genetics%20tutorial.htm

______________ =series of events that cells go through as they grow and develop CELL CYCLE

Figure 10–4 The Cell Cycle Section 10-2 G1 phase M phase S phase G2 phase

Cell Cycle Worksheetdefine each component of the cell cycle on the worksheetTextbook: Page 245

MAKE DRAWING OF THE FOUR PHASES OF MITOSIS ( COMPLETE ON LEGAL SIZE PAPER) • USE TEXTBOOK PAGE 247 • DRAW IN ORDER: PROPHASE, METAPHASE, ANAPHASE AND TELOPHASE. • USE ONLY THE COLORED CHROMOSOMES AS YOUR EXAMPLE OF EACH PHASE • LABEL EACH PHASE AND EXPLAIN WHAT HAPPENS DURING THE PHASE Creating the Four Phases of Mitosis

Pearson Education Inc publishing as Pearson Prentice Hall PROPHASE 1st dividing phase http://www.life.uiuc.edu/plantbio/102/lectures/08mit&veg102.html DNA scrunches into chromosomes

Chromosomes line up in ___________ middle METAPHASE Images from:Pearson Eduction Ince; Publishing as Pearson Prentice Hall http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0247.JPG

Centromeres splitCentrioles pull chromatids_______ apart ANAPHASE Images from:Pearson Eduction Ince; Publishing as Pearson Prentice Hall http://www.science.siu.edu/plant-biology/PLB117/JPEGs%20CD/0247.JPG

two See ______ nuclei Nuclear membrane & nucleolus return TELOPHASE (reverse prophase steps) Images from:Pearson Eduction Ince; Publishing as Pearson Prentice Hall http://www2.bc.cc.ca.us/cnewton/Biology%2011/Mitosis.html

CYTOKINESIS Cytoplasm splits into 2 cells CLEAVAGE FURROW

CYTOKINESIS Cytoplasm splits into 2 cells PLANT CELLS can’t pinch because they have a sturdy ____________ Plant cells separate cytoplasm by growing a _______________ down the middle. CELL WALL CELL PLATE http://www.eastcentral.edu/acad/depts/BI/plant_mitosis_nolabels.html

Figure 10–5 Mitosis and Cytokinesis Section 10-2 Spindle forming Centrioles Centromere Chromatin Centriole Nuclear envelope Chromosomes (paired chromatids) Interphase Prophase Spindle Cytokinesis Centriole Metaphase Individual chromosomes Telophase Anaphase Nuclear envelope reforming

Concept Map Section 10-2 Cell Cycle includes is divided into is divided into

M phase (Mitosis) Interphase G1 phase S phase G2 phase Prophase Metaphase Anaphase Telophase Concept Map Section 10-2 Cell Cycle includes is divided into is divided into

It would take twice the amount of time.