For what purpose would a microbial ecologist use a microsensor?

For what purpose would a microbial ecologist use a microsensor?
 
  A) to determine the concentration of cells in small increments in a sediment or water column
  B) to determine the expression of a particular gene in a microbial community
  C) to quantify the uptake of a radioactive material
  D) to determine the concentration of O2, N2O, or other chemical species in small increments in a sediment or water column

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Which molecular method allows for the detection of a specific organism within a diverse microbial community?
 
  A) fluorescent DNA staining using DAPI
  B) viability staining
  C) enrichment techniques
  D) fluorescent in situ hybridization

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Collective estimates of the physiological reactions occurring in the entire microbial community are known as ________ measurements.
 
  A) in vitro
  B) in situ
  C) activity
  D) metagenomics

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Which technique would be used to estimate the concentration of naturally occurring Escherichia coli in a wastewater sample?
 
  A) agar dilution tube method
  B) laser tweezers method
  C) most probable number (MPN) method
  D) cell tagging using GFP method

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Microarrays are useful for assessing
 
  A) gene expression.
  B) enzyme activity.
  C) the presence of specific rRNA sequences.
  D) gene expression and the presence of specific rRNA sequences.