1. Liceo classico “Gonzaga” Milano
Science course
From Prokaryotes to Eukaryotes
Teacher
Maria Elena Scortecci
UTILIZZARE SPAZIO PER INSERIRE FOTO/IMMAGINE DI RIFERIMENTO LEZIONE

2. diafragm and condenser lens
Microscope
eye pieces
revolver
stage
focus knob
diafragm and condenser lens
light source

3. Scientific classification
Prokaryotes
(bacteria and archaea)
unicellular (cell size 1-10 µm)
no nucleus (karyon) and organelles
special cell wall
single circular cromosome + plasmids
aerobic or anaerobic
reproduction by fission

4. (amoeboroa, fungi, animalia, plantae)
Scientific classification
Eukaryotes
(amoeboroa, fungi, animalia, plantae)
uni-multicellular (cell size µm)
several pairs of chromosomes in a nucleus
many organelles
only aerobic
sexual reproduction 4

5. How to observe cells pipettes blotting paper water
dye (i.e. methylene blue)
coverslips
microscope slides
paddle

6. Eukaryotes animalia (human buccal mucosa)
round cells
small blue nucleus
cytoplasmic membrane
cytoplasm
organelles 6

7. Prokaryotes bacteria (lactobacillus) from yoghurt
very small cells: 2 µm long
form filaments
metabolize lactose
produce lactic acid
no organelles 7

8. Eukaryotes fungi (saccharomyces cerevisiae) from brewer yeast
oval cells
nucleuses
dividing cells by budding
use glucose to produce energy, breathing oxigen 8

9. Eukaryotes plantae (pelargonium) prismatic cells in mutual contact
stiff
typical organelles: chloroplasts, chromoplasts, amyloplasts
no dye, because they are naturally stained cells
photosynthetic cells:
CO2 + H2O  glucose + oxygen 9

10. cyclamen leaves, with stomata and puzzle shape
Eukaryotes plantae
cyclamen leaves, with stomata and puzzle shape 10

11. Eukaryotes plantae
onion cell 11

12. stomata cells in Setcrasea
Eukaryotes plantae
stomata cells in Setcrasea 12

13. Eukaryotes plantae
tracheides in fennel 13

14. Copyright 2012 © eni S.p.A. 14 14