____ are the structures formed by roots that house nitrogen-fixing bacteria
Fill in the blank with the appropriate word.
Root nodules
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A microbiologist is attempting to determine the size of a microbial population and has employed several methods. She noticed that the direct count she obtained using a counting chamber and microscope was much higher than her estimate from doing a viable plate count. This discrepancy was encountered during multiple trials. What is the most likely reason for the discrepancy?
A. She counted incorrectly. B. She did not correctly do the serial dilutions prior to the viable plate count. C. The medium and growth conditions used for the viable count will not support the growth of the organisms. D. Many of the organisms viewed during the direct count may be dead. E. The organisms were not readily cultured on the viable count, either because many were dead or because the medium and growth conditions used for the viable count will not support the growth of the microorganism.
Heme prosthetic groups are involved in electron transfer with quinones
Indicate whether the statement is true or false.
A microbial ecologist who is interested in studying how gene expression is influenced by different species of bacteria in a biofilm would most likely find a metagenomic library more useful than a genomic library.
Answer the following statement true (T) or false (F)
Tissues derived from mesoderm are absent in
a. sponges. b. cnidarians. c. flatworms. d. sponges and cnidarians. e. sponges, cnidarians, and flatworms.