Lecture 1 notes
Tree of Life: Living organisms can be organized into 3 main branches and 2 cell types.
-The 3 main branches are eubacteria, archaebacteria, and eucaryotes.
-Eubacteria are what we traditionally refer to as bacteria.
-Archaebacteria look similar to eubacteria. They live in extreme conditions.
The 2 cell types are prokaryotes and eukaryotes.
Prokaryotes (example eubacteria)
-Mostly single-celled organisms
-They can form communities, stuck together by biofilms
-has cell wall, plasma membrane is selectively permeable
-Prokaryotic cells don’t have a nucleus or organelles.
-produces cholera toxin and can bring about severe diarrhea in humans.
Plants, fungi, animals, and humans
-single celled or multicellular
-There are membranes inside that enclose the DNA and specialized compartments.
-Eukaryotic cells have nuclei and organelles that
-Are complex and large
-The cytoskeleton plays a very important role in movement of molecules from one area to the
-Animal cells can move around because they lack a cell wall
-The mitochondria is the power house of the cell. Makes ATP
-Plant cells have chloroplasts which convert light energy into chemical e