The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase, as indicated by the results of a phenylalanine test. This enzyme facilitates the removal of a/an ______ group from the organic compound so it can be converted into an intermediate compound for the Krebs cycle.
A. phosphate
B. carboxyl
C. amino
D. hydroxyl
Answer: C
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Fermentation is sometimes used as a means of slowing food spoilage. Why would fermentation lead tothis outcome?
A. Fermentation is THE process that directly reduces sugars in food. Without sugars, bacteria cannot grow and spoil the food. B. Fermentation will lead to production of high levels of ethanol (95% or higher!)-ethanol will kill bacteria. C. Fermentation will lead to production of acidic by-products, dropping the pH of the food below a level that bacteria can tolerate. D. This is a trick question-fermentation actually IS food spoilage and cannot be used to prevent it under any circumstances.
In some species of sharks, babies hatch from shells within their mother's body. This is an example of
a. oviparity. b. viviparity. c. ovoviviparity. d. budding. e. fission.
In 1766, Buffon suggested that certain fossil forms might be ancient versions of similar living species.
a. true b. false
)
A. Macrophages B. Dendritic cells C. Neutrophils D. Eosinophils E. B cells