What technique is most useful for measuring microbial reproduction when the density of a microbial population is very small?
What does NOT happen at the maximum growth temperature of a microorganism?
membranes become rigid and fragile
Why would a particular microbe need to be cultured inside an animal?
Standard laboratory culture techniques have proven inadequate.
A chemoheterotroph obtains its energy from _____ and its carbon from _____ sources.
redox reactions; organic
The most commonly used isolation technique in microbiology laboratories is the _____.
Nitrogen is a growth-limiting nutrient because cells need it to manufacture _____.
proteins and nucleotides
Microbes in the _____ phase of the microbial growth curve are most susceptible to antimicrobial drugs.
Organisms that can grow with or without oxygen present are
facultative anaerobes or aerotolerant anaerobes
The use of salt and sugar in preserving various types of foods is an application of what concept?
T/F Obligate anaerobes have enzymes such as superoxide dismutase to protect them from the damaging effects of oxygen.
What quantification technique can distinguish living cells from dead cells in a culture?
New cells are being produced at the same rate as other cells are dying during the _____ of growth.
Why is cell growth typically graphed logarithmically?
Cell growth is rapid, and plotting the log of the number of cells versus the generation on a logarithmic graph produces a linear graph.
Why might cells begin to die at a faster rate than new cells are made?
Lack of nutrients and an increase in cellular waste products
What enables the copied chromosomes to separate during binary fission?
The chromosomes are attached to different parts of the cell membrane, which elongates and thus separates the chromosomes.
How long does it take for the daughter cells from one round of replication to replicate themselves?
No time is required- they are fully mature and ready to divide immediately after separation if conditions are right.
What would happen if the septum did not form during binary fission?
The parent cell would now have two copies of the chromosome.