Nester's microbiology Exam 2 with complete solutions

Biofilm A community of bacterial growth encased in a polymer (keeps them together) Complex Media One main source of all nutrients (beef extracts) 00:30 01:40 Chemically Defined Media Each ingredient is detailed out Selective Media Allows for growth of only one type Differential Media Allows for a distinguishing between different types based on physical characteristics Binary Fission Asexual process of reproduction in which one cell divides to form two daughter cells Pure Culture A population of organisms descended from a single cell Colony A distinct mass of cells arising from a single cell Psychrophiles cold-loving microbes Psychotrophs Organisms that grow between 0-30 degrees C and are responsible for most food spoilage while in the refrigerator Mesophiles those growing best between 20 degrees and 40 degrees C; the human pathogens are in this group Thermophiles heat loving microbes 00:00 01:40 Hyperthermophiles Also known as extreme thermophiles that survive at temperatures of 80 degrees celsius or higher Halophiles "salt-loving" archaea that live in environments that have very high salt concentrations