The Phylogenetic Trees of the NifH and SSU RRNA Genes

question 3

Multiple Choice

The phylogenetic trees of the nifH and SSU rRNA genes of nitrogen-fixing bacteria are incongruent because

• A) nitrogenase is an anaerobic enzyme.
• B) this is a characteristic of all enzyme genes.
• C) of horizontal gene transfer.
• D) very few microbes have the nifH gene.

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