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Prokaryotic Cells.

Published byΆτροπος Αβραμίδης Modified over 5 years ago

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Presentation on theme: "Prokaryotic Cells."— Presentation transcript:

1 Prokaryotic Cells

2 First organisms to evolve on Earth and still maintain the simplest cell structure.
Bacteria = prokaryotes

3 Most are: Found almost anywhere Small in size Unicellular Soil Water
Skin, intestines Areas of extreme temperatures

4 Diagram

5 Electron Micrograph Diagram

6 Electron Micrograph Diagram Pili

7 Pili: protein filaments that extend from the cell wall
Electron Micrograph Diagram Pili Pili: protein filaments that extend from the cell wall can be pulled in and pushed out “ratchet mechanism” Used for cell-cell adhesion (form aggregates) Used when two cells are exchanging DNA conjugation

8 Electron Micrograph Diagram Pili

9 Electron Micrograph Diagram Pili Nucleoid

10 Nucleiod: region of cytoplasm containing genetic material.
Electron Micrograph Diagram Pili Nucleoid Nucleiod: region of cytoplasm containing genetic material. **usually 1 molecule of DNA. DNA: circular and “naked” In Ems, nucleoid stained lighter because less ribosomes and proteins in the area.

11 Electron Micrograph Diagram Pili Nucleoid

12 Electron Micrograph Diagram Pili Nucleoid Ribosomes

13 Ribosomes: very small structures (70S) which synthesize proteins
Electron Micrograph Diagram Pili Nucleoid Ribosomes Ribosomes: very small structures (70S) which synthesize proteins smaller than eukarotic = 80S

14 Electron Micrograph Diagram Pili Nucleoid Ribosomes

15 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane

16 Plasma membrane: thin layer; consists of phospholipids
Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane Plasma membrane: thin layer; consists of phospholipids Controls entry/exit of materials Partially permeable Produces ATP

17 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane

18 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall

19 Cell Wall: is ALWAYS present Composed of peptidoglycan
Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane Cell Wall Cell Wall: is ALWAYS present Composed of peptidoglycan Protects the cell, prevents it from bursting Maintains the shape

20 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall

21 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall Capsule

22 Capsule: prevents cell from dessication;protection
Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane Cell Wall Capsule Capsule: prevents cell from dessication;protection Slippery so hard for antibodies to “eat” Why it can be a cause of some diseases.

23 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall Capsule

24 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall Capsule Flagella

25 Electron Micrograph Diagram
Pili Nucleoid Ribosomes Plasma membrane Cell Wall Capsule Flagella Flagella: with the use of energy, propels the cell from one area to another Solid/inflexible

26 Electron Micrograph Diagram Pili Nucleoid Ribosomes Plasma membrane
Cell Wall Capsule Flagella

27 Electron Micrograph Diagram Pili Cytoplasm Nucleoid Ribosomes
Plasma membrane Cell Wall Capsule Flagella

28 Cytoplasm: fluid filling the space inside the plasma membrane
Electron Micrograph Diagram Pili Cytoplasm Nucleoid Ribosomes Plasma membrane Cell Wall Capsule Flagella Cytoplasm: fluid filling the space inside the plasma membrane Consists of water & dissolved substances, enzymes, & ribosomes NO membrane-bound organelles Chemical reaction center

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