Microbes that dominate environments where organic matter is sparse are called what?
a. oligotrophs
b. chemolithotrophs
c. autotrophs
d. hypoorganotrophs
Answer: A
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The correct functions of your lungs contribute to the normal pH level of between 7.35 and 7.45. If your lungs do not exchange and remove carbon dioxide from your blood, the blood pH will change. A pH 6.4 reading of your blood indicates
A. a health problem due to the pH value being 10X higher OH- concentrations than normal in your body.
B. a health problem due to the pH value being 2X higher OH- concentrations than normal in your body.
C. a health problem due to the pH value being 2X higher H+ concentrations than normal in your body.
D. no health risk, as part of normal pH changes in your body that in this case bring it closer to neutral pH.
E. a health problem due to the pH value being 10X higher H+ concentrations than normal in your body.
True or False: In order to generate active immunity, individuals must be exposed to the actual pathogen itself. This is why vaccinations always contain live pathogens.
Answer the following statement true (T) or false (F)
A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arranged because _____.
A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
________ is a predator that bores a hole through the outer membrane of its Gram-negative bacterial prey and then reproduces in the periplasm.
A. Mycococcus B. Bdellovibrio C. Vampirococcus D. Syntrophobacter