Chapter 9 Flashcards
describe the isoelectric points of the enzymes of extreme alkaliphiles?
relatively high
Food spoilage is often caused by which type of microbe?
psychrotrophs
Which of the following pigments are especially useful at great depths, where less light penetrates?
fucoxanthin and phycobilins
Which type of microbes thrive in the Great Salt Lake?
extreme halophiles
What best describes why extracellular polymeric substances are important?
They are components of a biofilm secreted by the microbes present.
Which type of system is used to maintain bacteria in a relatively constant environment, allowing them to stay in the log phase of growth?
chemostat
Which of the following is the term for free-living bacteria?
planktonic
What media is commonly used to determine the oxygen requirements of a bacterial species?
thioglycolate medium
What structure separates new daughter cells in binary fission?
the division septum
What best describes the fatty acids of cell membranes of microbes that thrive at low temperatures?
They have relatively high amounts of unsaturated fatty acids.
What type of organism can survive at great depths in the ocean?
barotolerant
What is another term for generation time?
doubling time
What is the most common category of bacteria?
neutrophiles
A candle jar is often used to grow what type of bacteria?
capnophiles
What best defines the term “persisters?
cells with relatively slow metabolic rates that survive longer than others during the death phase and that can cause chronic infections
