Which is correct for the description "alkaline slant, acid butt, no H2S"?
a. Salmonella spp.
b. E. coli
c. Proteus spp.
d. Pseudomonas spp.
B
Biochemical profiles obtained with TSI agar are often used to identify enteric pathogens pre-sumptively. Organisms that exhibit the profiles listed require further biochemical profiling and, in the case of Salmonella spp. and Shigella spp., serotyping to establish a definitive identification.
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The following are steps involved in abscisic acid's (ABA) role in stomata closure. Arrange them in the correct order of events. a. The resulting voltage change across the guard cell plasma membranes opens gated transport proteins that allow potassium ions to exit the cells
b. ABA binding to its receptor on a guard cell membrane causes the release of nitric oxide (NO). The NO activates calcium transport proteins and an influx of calcium occurs. c. Water follows the solutes by osmosis. d. The guard cells lose turgor and collapse against one another, closing the stoma. e. Calcium influx activates transport proteins that pump negatively charged malate and chloride ions out of the cells. Thus, the overall charge of cytoplasm increases, and the overall charge of extracellular fluid decreases.
Four of the five choices listed below are related by a
common number. Select the exception. a. number of nucleotides in a codon b. number of building blocks (parts) in a nucleotide c. number of STOP codons d. number of types of DNA e. number of types of RNA
Soil nitrogen is not solely contained within the rhizoids of the Dawsonia mosses because rhizoids _____
A) are associated with fungi that inhibit mineral transfer from soil to rhizoids B) are not absorptive structures C) lack direct attachment to the moss sporophytes D) immediately transfer the nitrogen to the sporophyte
Glyceraldehyde-3-phosphate can do all of the following except
A. be converted to usable energy for the cell. B. manufacture lipids. C. produce trace elements required for plant growth (nitrogen, magnesium, phosphorus, etc.). D. be converted to ribulose.