An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate that medium containing microorganisms is removed is called a ________.
A. culturostat
B. chemostat
C. turbidostat
D. manostat
Answer: B
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E. coli resides in our small and large intestines and, in the process of nourishing itself by digesting the "leftovers" it finds in our digestive tracts, provides us with (select all correct choices):
A. essential amino acids. B. vitamin K. C. essential fatty acids. D. minerals such as zinc and iron. E. vitamin D.
Keystone species:a
are always symbionts. b. are typically not the most abundant species in the community. c. illustrate secondary succession. d. always form the base of a food chain. e. are only found in tropical communities
Some microbes convert iron to magnetite, which is then used as an internal compass to help position the microbe correctly in its environment.
Answer the following statement true (T) or false (F)
The Northern leopard frog (Rana pipiens) and Southern leopard frog (Rana utricularia) are morphologically similar, but they do not mate. They sound very different when calling for a mate. Which mechanism may explain why these frogs are listed as separate species?
A. the inability to interbreed because of morphological differences. B. the difference in bone structure and skin color of the organisms. C. DNA sequences of particular genes. D. the habitat of the organisms. E. both the DNA sequences of particular genes and the inability to produce viable offspring.