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Hit and Miss

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Passive Transport: a primer



Diffusion
Concentration gradient
Substance specific!!!!!!!!!




Passive transport
Osmosis

LE 7-11a

Molecules of dye

Membrane (cross section)

WATER

Net diffusion

Net diffusion

Equilibrium

Net diffusion

Equilibrium

Diffusion of one solute

Net diffusion
Net diffusion

Net diffusion

Equilibrium

LE 7-12

Lower concentration of solute (sugar)

Higher concentration of sugar

H2O

Selectively permeable membrane: sugar molecules cannot pass through pores, but water molecules can

Osmosis

Same concentration of sugar

Lecture 5
Introduction to
Domain Bacteria and
Archaea (aka
Kingdom Monera)

The First Forms of Life
3.5-4.0

bya
Simple ≠ primitive 4 Billion years of evolution!!! Prokaryotes are the
Simplest Form of Life
Small (1-5 μm)
 Uncomplicated structure  Evolution and diversity 

 chemical level
Single

cells

 colonies

Prokaryotic Structural
Diversity


Limited to three shapes
 Spherical -> cocci
 Rod-shaped -> bacilli
 Helical -> spirochetes or spirilla Prokaryotes v. Eukaryotes
See Table 27.2
All cells have:
- Plasma membrane
- Chromosomes
- Cytosol
- ribosomes

Nuceoid
 No organelles
 Small
 High SA/V


Nucleus
 Organelles
 Big
 Low SA/V


Basic Prokaryotic Cell
Structure
Cytoplasm
cell membrane
cell wall
DNA

Basic Prokaryotic Cell
Structure
cell membrane

cell wall

Classification of the
Prokaryotes
Two main branches:

Archaea, Bacteria
Five kingdom system (both in Kingdom
Monera)
Three domain system (separate domains)

Distinction between
Archaea and Bacteria
Archaea
(archaebacteria)
 older
confined to extreme habitats


Distinction between
Archaea and Bacteria
Archaea

have

no peptidoglycan in cell wall

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