BIOL 1010 Lecture Notes - Lecture 1: Cell Membrane, Cell Theory, Multicellular Organism
Document Summary
All organisms are composed of one or more cells. (if it is alive, it is made of cells) The cell is the structural unit of life. Cells can only arise by division from a pre-existing cell. Multi-cellular organism are a series of specialized cells that could not survive for long on their own. All cells share basic features: they are all bounded by a selective barrier called the plasma membrane. Exam question: compare and contrast prokaryotic and eukaryotic cells. Prokaryotic cells- before nucleus, dna is not contained within a membrane bound nucleus, no membrane bound organelles, ex. Bacteria and archaea (live in extreme temperatures) organelles are separated by regions. Eukaryotic cells- true nucleus, dna is compartmentalized in a nucleus, membrane-bound organelles ex. Protists, fungi, plants and animals, generally larger than prokaryotic cells. The logistics of carrying out cellular metabolism sets limits on cells seize.