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If you wanted to know which strains of rhizobia were present in a plot of soil in a soybean field,
and what differences were present in the Nod factor genes of those strains, which of the
following would be most useful/comprehensive? Collect nodules from the roots of nodulated
soybean plants in the plot. Isolate rhizobia from nodules. Grow cultures of each strain to use as
an inoculum for different types of legumes (soybean, pea, clover, bean, vetch, etc.). Test each
strain against each legume to see which ones can successfully be nodulated by that particular
strain. Collect soil samples in the field and obtain the DNA from the bacteria within. Carry out
metagenomics using that DNA to identify the bacteria, and to make comparisons of the Nod
genes present in the samples. Isolate rhizobia from soil samples collected from the field. For
each of the bacterial strains isolated, incubate in fresh media containing nintrients labeled with
13 C (heavy carbon). After time to grow, isolate DNA from each strain, and centrifuge to
separate labeled vs. unlabeled DNA. Sequence the labeled DNA to identify the bacteria of
interest. If you wanted to know which strains of rhizobia had been able to nodulate legume plants
in a field, and identify other strains of bacteria present (including rhizobia and other types of soil
bacteria), which of the following would be most useful/comprehensive? Isolate rhizobia from
nodules, and from soil samples collected from the field. After incubation, subject the pure strains
of all isolated bacteria to a series of biochemical tests to observe similarities and differences, and
use these results to make identifications. Isolate rhizobia from nodules, and from soil samples
collected from the field. For each of the bacterial strains isolated, incubate in fresh media
containing nutrients labeled with 13 C (heavy carbon). After time to grow, isolate DNA from
each strain, and centrifuge to separate labeled vs. unlabeled DNA. Sequence the labeled DNA to
identify the bacteria of interest. Isolate rhizobia from nodules, and collect soil samples in the
field. Obtain the DNA from the isolated rhizobia, and the soil samples. Carry out 16 S rRNA
gene analysis or metagenomics to identify the bacteria in each case. If you wanted to know
which strains of rhizobia were present in a plot of soil in a soybean field, and what differences
were present in the Nod factor genes of those strains, which of the following would be most
useful/comprehensive? Collect soil samples in the field and obtain the DNA from the bacteria
within. Carry out metagenomics using that DNA to identify the bacteria, and to make
comparisons of the Nod genes present in the samples. Isolate rhizobia from soil samples
collected from the field. For each of the bacterial strains isolated, incubate in fresh media
containing nutrients labeled with 13 C (heavy carbon). After time to grow, isolate DNA from
each strain, and centrifuge to separate labeled vs. unlabeled DNA. Sequence the labeled DNA to
identify the bacteria of interest. Collect nodules from the roots of nodulated soybean plants in the
plot. Isolate rhizobia from nodules. Grow cultures of each strain to use as an inoculum for
different types of legumes (soybean, pea, clover, bean, vetch, etc.). Test each strain against each
legume to see which ones can successfully be nodulated by that particular strain.
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If you wanted to know which strains of rhizobia were present in a plot.pdf

  • 1. If you wanted to know which strains of rhizobia were present in a plot of soil in a soybean field, and what differences were present in the Nod factor genes of those strains, which of the following would be most useful/comprehensive? Collect nodules from the roots of nodulated soybean plants in the plot. Isolate rhizobia from nodules. Grow cultures of each strain to use as an inoculum for different types of legumes (soybean, pea, clover, bean, vetch, etc.). Test each strain against each legume to see which ones can successfully be nodulated by that particular strain. Collect soil samples in the field and obtain the DNA from the bacteria within. Carry out metagenomics using that DNA to identify the bacteria, and to make comparisons of the Nod genes present in the samples. Isolate rhizobia from soil samples collected from the field. For each of the bacterial strains isolated, incubate in fresh media containing nintrients labeled with 13 C (heavy carbon). After time to grow, isolate DNA from each strain, and centrifuge to separate labeled vs. unlabeled DNA. Sequence the labeled DNA to identify the bacteria of interest. If you wanted to know which strains of rhizobia had been able to nodulate legume plants in a field, and identify other strains of bacteria present (including rhizobia and other types of soil bacteria), which of the following would be most useful/comprehensive? Isolate rhizobia from nodules, and from soil samples collected from the field. After incubation, subject the pure strains of all isolated bacteria to a series of biochemical tests to observe similarities and differences, and use these results to make identifications. Isolate rhizobia from nodules, and from soil samples collected from the field. For each of the bacterial strains isolated, incubate in fresh media containing nutrients labeled with 13 C (heavy carbon). After time to grow, isolate DNA from each strain, and centrifuge to separate labeled vs. unlabeled DNA. Sequence the labeled DNA to identify the bacteria of interest. Isolate rhizobia from nodules, and collect soil samples in the field. Obtain the DNA from the isolated rhizobia, and the soil samples. Carry out 16 S rRNA gene analysis or metagenomics to identify the bacteria in each case. If you wanted to know which strains of rhizobia were present in a plot of soil in a soybean field, and what differences were present in the Nod factor genes of those strains, which of the following would be most useful/comprehensive? Collect soil samples in the field and obtain the DNA from the bacteria within. Carry out metagenomics using that DNA to identify the bacteria, and to make comparisons of the Nod genes present in the samples. Isolate rhizobia from soil samples collected from the field. For each of the bacterial strains isolated, incubate in fresh media containing nutrients labeled with 13 C (heavy carbon). After time to grow, isolate DNA from each strain, and centrifuge to separate labeled vs. unlabeled DNA. Sequence the labeled DNA to identify the bacteria of interest. Collect nodules from the roots of nodulated soybean plants in the plot. Isolate rhizobia from nodules. Grow cultures of each strain to use as an inoculum for different types of legumes (soybean, pea, clover, bean, vetch, etc.). Test each strain against each legume to see which ones can successfully be nodulated by that particular strain.