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Iodine

Glucose:

Lab 5.2: Diffusion Through a Membrane Results

Iodine

AFTER

Iodine

BEFORE

Starch:

StarchGlucoseStarch + Iodine

Glucose OnlyIodineIodineOnlyBenedictsBenedicts+ GlucoseBenedicts + GlucoseGlucose OnlyHeatHeatQuestion: Explain why farting in an elevator is an example of diffusion.

Answer:

2s Turn In: p. 194 A.Q. 1abc 3ab, 4, 5Inv. 5.2: Diffusion Through a MembraneQuestion of the DayMore than 25 types of elements3

AnnouncementsLab Quiz TuesdayBiosphere ObservationsTest Corrections1/3 of a point back per questionLast Day: Wednesday, 11/20Quiz!Cell Structures & Functions

Unit 4 Vocab

Elodea Cells in WaterElodea Cells in Salt WaterOsmosis: Diffusion of WaterMembrane-bound sacImportant for intracellular digestion, release of waste productsSmall in animal cells, large in plant cells8

40. hypertonic- concentration of solutes is high outside of the cell, causing water to leave

Animal Cell:Plant Cell:Unit 4 Vocab

Above strength9

41. hypotonic- concentration of solutes is low outside of the cell, causing water to enter

Animal Cell:Plant Cell:Unit 4 Vocab

Means below strength1039. isotonic- solute concentrations are equal inside and outside of the cell

Animal Cell:Plant Cell:Unit 4 Vocab

Same strength11Most cells are between 2m and 200mA micrometer is 1 millionth of a meter!Why Are Cells So Small?

Inv. 5.3: Cell Size & Diffusion

43. surface area- the total area of the outside of an object44. volume- the total amount of space inside an object45. surface area : volume ratio- the amount of surface area per unit volume;helps explain why cells must be small

The volume of a cell increases much faster than its surface area! This causes transport of molecules in and out of the cell to be too slow for the cell to survive!

14Diffusion limits cell sizeLarger distance = longer time to get through cell20 cm cell: months for nutrients to get to the centerVolume increase more rapidly than surface area

Why Are Cells So Small?

#57.What cant organisms just be 1 giant cell?15p. 194 A.Q. 1abc, 3ab, 4, 51a. What is a cell?1a. A cell is the basic unit of life.

1b. What three statements make up the cell theory?1b. The three statements that make up the cell theory are: All living things are made up of cells.Cells are the basic unit of structure and function in living things.New cells are produced from existing cells.

p. 194 A.Q. 1abc, 3ab, 4, 5

1c. How did the invention of the microscope help the development of the cell theory?1c. The microscope enabled people to see cells and study the parts of cells. This ability enabled scientists to learn that all organisms are composed of cells.

p. 194 A.Q. 1abc, 3ab, 4, 5

3a. What features do all cells have?3a. All cells have DNA at some time in their lives and all cells are surrounded by a thin, flexible membrane.

3b. What is the main difference between prokaryotes and eukaryotes?3b. Prokaryotes do not have DNA enclosed in a nucleus. Eukaryotes have DNA enclosed in a nucleus.p. 194 A.Q. 1abc, 3ab, 4, 5

Prokaryote:Eukaryotes:4. What is the total magnification of a microscope that has an eyepiecemagnification of 10x and an objective lens magnification of 50x?4. The total magnification is 500x.

A 10 micrometer cell is viewed through a 10x objective and a 10x eyepiece. How large will the cell appear to the microscope user?5. The cell will appear to be 1000 micrometers (1 mm).p. 194 A.Q. 1abc, 3ab, 4, 5Before they become too big to survive

When Do Cells Divide?#59.

Mitosis:What cant organisms just be 1 giant cell?21