LIFESCI 2 Lecture Notes - Lecture 3: Cell Junction, Centrosome, Lysosome
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Archaea: look like bacteria, but have different processes a. iii. Many are unicellular, some are multicellular: multicellular b. i. A lot of unicellular organisms were trading genes among themselves c. ii. Often early in life, it wasn"t a simple ancestor-descendent relationship; rather, there was a more lateral flow of dna. Prokaryotes vs. eukaryotes: eu : true, pro : primitive, however, to say that some are primitive and others are true is not completely accurate c. i. Bacteria that are around us today have had as long an evolutionary history as we have c. ii. To say that they are primitive is a bit of a misnomer: prokaryotes: bacteria & archaea, eukaryotes: protists, plants, fungi, animals. Polar end that"s hydrophilic facing outside & hydrophobic facing inside a. i. 2. This makes it hard for water to get through a. ii. Cholesterol is embedded in the cell membrane a. ii. 1. Gives some rigidity to the cell membrane a. iii. Much bigger structures as well: proteins, glycoproteins, lipoproteins a. iii. 1.
