liceo classico gonzaga milano science course from prokaryotes to eukaryotes teacher maria elena...
TRANSCRIPT
Liceo classico “Gonzaga”Milano
Science course
From Prokaryotes to Eukaryotes
Teacher
Maria Elena Scortecci
UTILIZZARE SPAZIO PER INSERIRE FOTO/IMMAGINE DI RIFERIMENTO LEZIONE
2
Microscope
diafragm and condenser lens
stage
revolver
eye pieces
focus knob
light source
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
3
4
Scientific classification
Eukaryotes(amoeboroa, fungi, animalia, plantae)
• uni-multicellular (cell size 10-100 µm)
• several pairs of chromosomes in a nucleus
• many organelles
• only aerobic• sexual reproduction
4
5
How to observe cells
microscope slides
pipettes
waterdye (i.e. methylene blue)
paddle
coverslips
blotting paper
6
Eukaryotes animalia(human buccal mucosa)
6
• round cells• small blue
nucleus• cytoplasmic
membrane• cytoplasm • organelles
Prokaryotes bacteria(lactobacillus) from yoghurt
7 7
• very small cells: 2 µm long
• form filaments• metabolize
lactose• produce lactic
acid• no organelles
8
Eukaryotes fungi (saccharomyces cerevisiae) from brewer yeast
8
• oval cells• nucleuses• dividing cells by
budding• use glucose to
produce energy, breathing oxigen
9
Eukaryotes plantae(pelargonium)
9
• 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
10
Eukaryotes plantae
10
cyclamen leaves, with stomata and puzzle shape
11
Eukaryotes plantae
11
onion cell
12
Eukaryotes plantae
12
stomata cells in Setcrasea
13
Eukaryotes plantae
13
tracheides in fennel
14 14
Copyright 2012 © eni S.p.A.