Exam 5: Microbial Growth and Control

Taq polymerase was isolated from a thermophile and is used in the polymerase chain reaction (PCR)technique because it does not become inactivated at high temperatures.

In fast-growing Escherichia coli cells,multiple replication forks of genomic DNA allows binary fission to occur before the genome has been fully duplicated.

The duration of logarithmic growth would increase if bacterial cells divided into three equal daughter cells rather than two.

The process by which two cells arise from one is known as

A halotolerant facultative anaerobic bacterium would grow BEST in a ________ environment.

Enumerating cells in a biofilm is especially challenging for

Propose a growth setup that an industrial microbiologist would create to obtain large quantities of a bacteriocidal product of secondary metabolism.Be certain to explain how temperature and dissolved oxygen parameters would be selected as well as how stationary growth phase would be maintained.

In a chemostat,growth rate and growth yield can be controlled independently.

Many aromatic compounds used for growth substrates by bacteria are broken down during high heat autoclaving.Which is the BEST way to sterilize these aqueous solutions?

The time interval required for the formation of two cells from one is called the

An antiseptic (or germicide)is distinguished from other sterilizing compounds by

Which of the following forms of oxygen is/are generally toxic to living organisms?

Growing bacteria that degrade an environmental pollutant,which is also toxic to the cells at artificially high concentrations,might require ________ to obtain a sufficient population for biochemistry studies.

Bacteria that are able to grow in humans and cause disease have likely evolved to be

One laboratory group repeated the same experiment described by others with the identical bacterial isolate and the same growth medium and conditions used but were unable to achieve the same O.D.at 600 nm.What is the LEAST likely cause for this discrepancy of turbidity measured?

Which of these statements is/are TRUE?

The ratio of the vapor pressure of the air in equilibrium with a substance to the vapor pressure of pure water is known as

By using a stain targeting living cells only,microscopy would be a better approach to enumerate the number of living cells in a soil sample compared to viability counts of serially diluted soil.

Explain the difference between the division rate and the generation time.

Cell density in a chemostat is controlled by