Which organism is a nitrogen fixing symbiont of legumes?
A. Rhizobium
B. Nostoc
C. Pseudomonas
D. Azotobacter
E. Nitrobacter
Answer: A
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Describe floc formation in the activated sludge process
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The rearrangement of alleles by the process of crossing over is called genetic linkage
Indicate whether the statement is true or false
Which of the following observations did not influence Darwin's later thoughts about evolution?
a. The discovery of fossils that resembled extant organisms in the same region. b. The observation that animals from similar habitats in South America and Europe were very different. c. A great variety of species exist across the globe. d. Species on islands differed from species on the mainland closest to the island. e. North American and South American species were more similar to each other than European and African species.
Which cell types would be considered germ cells?
A) oogonia and spermatogonia B) primary oocytes and spermatocytes C) secondary oocytes and spermatocytes D) ova and spermatids E) all of the choices are germ cells