AP Biology Catalyst Which of the following choices lists the Organization of Life in order of increasing complexity? Organism Organs Organ Systems Cells Tissues Organs Cells Tissues Organ Systems Organism Cells Tissues Organs Organ Systems Organisms Tissues Organs Organ Systems Cells Organism 2. What is the main difference between prokaryotes and Eukaryotes? 3. Where do you find the DNA in a Eukaryote? A prokaryote?
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AP Biology Catalyst Which of the following choices lists the Organization of Life in order of increasing complexity? Organism Organs Organ Systems.
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AP Biology
Catalyst Which of the following choices lists the Organization of Life in order of
increasing complexity? Organism Organs Organ Systems Cells Tissues Organs Cells Tissues Organ Systems Organism Cells Tissues Organs Organ Systems Organisms Tissues Organs Organ Systems Cells Organism
2. What is the main difference between prokaryotes and Eukaryotes?
3. Where do you find the DNA in a Eukaryote? A prokaryote?
AP Biology
The Cell Membrane (Plama membrane)
AP Biology
Overview Cell membrane separates living cell from
nonliving surroundings thin barrier = 8nm thick
Controls traffic in & out of the cell selectively permeable allows some substances to cross more easily
than others hydrophobic vs hydrophilic
Made of phospholipids, proteins & other macromolecules
AP Biology
Phospholipids
Fatty acid
Phosphate
Fatty acid tails hydrophobic
Phosphate group head hydrophilic
Arranged as a bilayer- what is a bilayer?
Aaaah, one of those
structure–functionexamples
AP Biology
Phospholipids are the major structural component of
membranes.Heads are made of
phosphate group and alcohol
Tails are nonpolar and made of carbon and
hydrogen.
AP Biology
Phospholipid bilayer
polarhydrophilic
heads
nonpolarhydrophobic
tails
polarhydrophilic
heads
AP Biology
More than lipids… In 1972, S.J. Singer & G. Nicolson
proposed that membrane proteins are inserted into the phospholipid bilayer
It’s like a fluid…It’s like a mosaic…
It’s the Fluid Mosaic Model!
AP Biology
Membrane is a collage of proteins & other molecules embedded in the fluid matrix of the lipid bilayer