1) MOLECULE: Two or more atoms chemically bonded together. FOR EXAMPLE: O + O O 2 H + H + O H 2 O 6C + 12H + 6O C 6 H 12 O 6

CONCENTRATION: 2) CONCENTRATION: The degree to which molecules are packed together. LOW HIGH

3) DIFFUSION: The movement of molecules from an area where their concentration is high to an area where their concentration is low.

Diffusion of food coloring in water. High concentration Low concentration Don’t copy this slide just watch. Equal concentration

Diffusion of food coloring in water. High concentration Low concentration Equal concentration

4) SELECTIVELY PERMEABLE MEMBRANE: A membrane that permits only certain particles to pass through. (FOR EXAMPLE: The cell membrane allows water and oxygen to pass through freely).

Low Concentration High Concentration Equal Concentration inside & outside Don’t copy this slide just watch.

High Concentration Low Concentration Equal Concentration inside & outside

OSMOSIS: 5) OSMOSIS: The diffusion of water in and out of the cell. Low Concentration High Concentration Equal Concentration Inside & Outside Copy the definition for Osmosis only.

6) In “Osmosis,” water molecules from a higher concentration to a lower concentration of H 2 O molecules. move

Low Concentration High Concentration 7) Adding “Salt” or other particles to water lowers the concentration of H 2 0 molecules.

Is the concentration of water molecules higher inside or outside of the cell? Don’t copy this slide just watch.

Low concentration of H 2 O High concentration of H 2 O Is the concentration of water molecules higher inside or outside of the cell? Don’t copy this slide just watch.

Low concentration of H 2 O High concentration of H 2 O Now we have equal concentration inside and outside the cell Don’t copy this slide just watch.

8) ACTIVE TRANSPORT: The process in which a cell (from ATP) to transport particles into or out of the cell. uses energy

EXAMPLE: An Amoeba engulfing another organism.

9) ENDOCYTOSIS: movement of a large particle into the cell using the cell membrane to surround the particle and form a vesicle.

10) EXOCYTOSIS: movement of a large particle out of the cell by first surrounding it with a vesicle and then moving it to the cell membrane where it is expelled.

Stop the notes here for the Diffusion & Osmosis QUIZ. The remaining notes will be given and discussed after Christmas break. Mr. Coski Stop the notes here for the Diffusion & Osmosis QUIZ. The remaining notes will be given and discussed after Christmas break. Mr. Coski

1) Cell Cycle: The life cycle of a cell which begins when the cell is formed and ends when it divides and forms two new cells. 2) Chromosome: Is a coiled bundle of DNA and protein that is located in the cell nucleus. 3) Centromere: The region that holds chromosomes together when a chromosome is duplicated. Also the region of spindle attachment when individual chromosomes are pulled to opposite ends of the cell.

CELL CYCLE STICK FIGURE DRAWINGS

INTERPHASE DNA DNA is copied so there are twice as many strands of DNA.

MITOSIS - (Prophase) Chromosomes spindle Nuclear membrane breaks up, spindle begins to form, and DNA coils up to form Chromosomes.

MITOSIS - (Metaphase) Centromere Sister Chromosomes spindle Spindle attaches to centromere and chromosomes line up in middle of cell. Sister Chromosomes

MITOSIS - (Anaphase) Centromere Sister chromosomes are pulled to opposite ends of cell by spindles. Sister Chromosomes

MITOSIS - (Telophase) Chromosomes begin to uncoil back to strands of DNA. Two new nuclear membranes begin to form.

CYTOKINESIS Cytoplasm pinches in and all the organelles are equally divided between the two new daughter cells.