LIFE 102 Lecture Notes - Cell Fractionation, Vacuole, Lysosome
Document Summary
Concept 5. 5: nucleic acids store and transmit hereditary information. Nucleic acids are made of monomers called nucleotides. All organisms are made of cells (tiny packages) The cell is the simplest collection of matter that can live. Cells are surrounded by membranes made of a phospholipid fabric , interwoven with cholesterol and protein. Cells are filled with even smaller packages called organelles that also have membranes. Scanning electron microscopes (sems) focus a beam to electrons onto the surface of a specimen. Transmission electron microscopes (tems) focus a beam of electrons through a specimen. Tems are used mainly to study the internal structure of cells. Cell fractionation takes cells apart and separates the major organelles from one another. Cell fractionation enables scientists to determine the functions of organelles. Biochemistry and cytology help correlate cell function with structure. No nucleus (that is, no membrane around dna) Dna in an unbound region called the nucleoid.
