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Cellular Biology Chapter 3.

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Presentation on theme: "Cellular Biology Chapter 3."— Presentation transcript:

1 Cellular Biology Chapter 3

2 The cell theory

3 So what is a cell?

4 Characteristics of animal cells
plasma membrane cytoplasm organelles ribosomes cytoskeleton DNA*

5 Organelles (there are other cellular structures that are not organelles)

6

7 Cell parts: plasma membrane
Made of a phospholipid bilayer

8 Embedded molecules of the plasma membrane
Carbohydrates: Lipids (cholesterol): Proteins

9 Movement of molecules across a plasma membrane
Diffusion Osmosis Active transport Endocytosis & exocytosis

10 Diffusion

11 Osmosis

12 Water balance between a cell & its environment
Tonicity: Hypertonic solution Hypotonic solution Isotonic solution

13 Active transport

14 Moving large molecules across a plasma membrane
Exocytosis Endocytosis

15 Exocytosis

16 Endocytosis

17 Cells do a lot of work! Actively transport substances across membranes
Build membranes & associated proteins Build macromolecules from smaller components Move cellular parts w/in the cell Move the whole cell Maintain homeostasis ****This all takes energy!****

18 Two types of energy Kinetic: Potential:

19 Energy coupling

20 So, what is ATP?

21 Splitting of ATP

22 Phosphorylation

23 Can cells use less energy??
Yes!

24 How enzymes work The making of a product

25

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