BMS 212 Lecture Notes - Lecture 7: Endoplasmic Reticulum, Golgi Apparatus, Nuclear Membrane
Document Summary
Integral in the establishment of virology: viruses vs. life. Criteria for life: growth- the ability to increase in size, reproduction- the ability to increase in number, responsiveness- change in internal/external properties in response to the environment, metabolism- taking in nutrients, reactions to create energy that"s stimulate growth. *viruses do not meet criteria 1 or 4, so they are defined as particles * Structure: naked, enveloped, common structure to all viruses, central core. Nucleic acid: dna or rna, single or double stranded, circular or linear, segmented or non-segmented. Small number of genes i. e. humans have 30,000, hepatitis b has 4. Most common tight helical packing results in no envelope, very rigid looser helical packing results in an envelope, flexible: icosahedron. 20 faces: pentons form the corners, hexons form the faces, envelope. Derived from the cell membrane, nuclear membrane, golgi apparatus, or endoplasmic reticulum.
