Discuss antimicrobial susceptibility testing and the use of minimal inhibitory concentration (MIC) values
What will be an ideal response?
Answer: Antimicrobial susceptibility is measured by determining the smallest amount of agent needed to completely inhibit the growth of the test organism in vitro. This value is called the minimum inhibitory concentration (MIC). The MIC is determined by preparing a series of culture tubes that are inoculated with the same number of microorganisms. Each tube contains liquid medium with increasing concentration of the antimicrobial agent. After incubation, the tubes are checked for visible growth. This is usually completed using an automated format. A miniaturized version of this test shows a standard microtiter method using twofold dilutions of several antibiotics in medium inoculated with a standard amount of the test bacteria.
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____ are the structures formed by roots that house nitrogen-fixing bacteria
Fill in the blank with the appropriate word.
Which T cell is responsible for releasing cytokines?
a. Cytotoxic T cells b. Helper T cells c. Regulatory cells d. Memory Cells
Deletion of one of the two trp codons in the leader sequence of the TRP operon (att-) result
a. the operon never being transcribed b. in little or no phenotype in the presence of high TRP in the cell. c. in the operon not being able decrease production of TRP when TRP is high in the cell. d. an increase in the production of TRP regardless of the levels of TRP in the cell