Brock Biology of Microorganisms Chapter 5 with 100% complete solutions

growth increase in the number of cells binary fission cell division following enlargement of a cell to twice its minimum size 00:19 01:22 septum partition between dividing cells; pinches off between two daughter cells generation time time required for microbial cells to double in number (can be affected by nutrition, genetics, and temperature) budding division results from unequal cell growth and forms totally new daughter cell (also similarly involve stalks, hyphae, appendages, polar growth without differentiation of cell size) planktonic growth growth as suspension sessile growth -growth when attached to surface -can develop into biofilms biofilms -attach polysaccharide matrix containing embedded bacteria -form in stages -prevent harmful chemicals (like antibiotics) from penetrating -prevent protists from grazing -prevent washing away of cells -can affect human health, water distribution cycles, and fuel storage biofilm stages of growth Stage I: planktonic cells attach Stage II: sticky matrix forms microbial mats multilayered sheets with different organisms in each layer (ex. hot springs, intertidal regions) exponential growth growth of a microbial population in which cell numbers double within a specific time inteval instantaneous growth rate constant (k) expresses rate of growth at any given instant (initial increases is slow but gains speed)