Chapter 7 Keywords Flashcards
The initial growth phase, during which cell number remains relatively constant prior to rapid growth
Lag phase
The phase of a growth curve during which the population is growing at a constant and maximum rate
Exponential Phase
The process of forming a cross wall between two daughter cells during cell division
Septation
An organism that requires a salty environment
Halophile
Microorganisms that grow in extreme environments.
Extremophiles
process in which bacteria monitor their own population density by sensing the levels of signal molecules that are released by the microorganisms.
quorum sensing
Microorganisms that do not require oxygen for growth but do grow better with it
Facultative Anaerobe
an organism, especially a bacterium, that does not require air or free oxygen to live
Anaerobe
The decrease in the number of viable microorganisms that occurs after the completion of growth in culture
Death Phase
The time required for a microbial population to double in number
Generation time
Asexual reproduction in which a cell or an organism separates into two identical daughter cells
Binary Fission
Enzymes that partially digest peptidoglycan in growing bacteria so that the cell wall can be enlarged.
Autolysins
Requiring high temperatures for normal development, as certain bacteria
Thermophile
The phase of microbial growth in a batch culture when population growth ceases and the growth curve levels off.
Stationary phase
An increase in the number of microorganisms
Growth
An organism, such as a bacterium, requiring oxygen to live
Obligate aerobe
Processes that apportion the cytoplasm and organelles, synthesize a septum, and divide a cell into two daughter cells during cell division.
Cytokinesis
A microorganism that has its growth optimum between about pH 0 and 5.5.
Acidophile
a group of proteins that are characterized by their affinity for and binding of penicillin. They are normally involved in the polymeriztion and modification of peptidoglycan
Penicillin Binding Proteins
Organized microbial communities associated with surfaces, often with complex structural and functional characteristics
Biofilm
the best or most favorable point, degree, amount, etc., as of temperature, light, and moisture for the growth or reproduction of an organism.
Optimum
