Old stories tell of gigantic sea serpents, possibly ancient reptiles called plesiosaurs. To prove that they still exist, the most useful scientific evidence would be which of the following?
A) Good photographs of the creatures
B) Reliable eye-witness accounts of seeing them
C) Unexplained bite marks on fish
D) A fresh skull with flesh still attached
D) A fresh skull with flesh still attached
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Fossils
(a) are remains of organisms. (b) are formed when organic materials are replaced with minerals. (c) provide evidence of evolution. (d) are all of the above.
A certain wastewater treatment plant uses aerobic bacteria, anaerobic bacteria, and archaebacteria during secondary treatment of sewage. Unfortunately, during a bad blizzard the aerated tanks froze, killing the microbes inside. What is likely to result?
A. Solid material will not be effectively filtered out. B. Floc will not be effectively filtered out. C. Methane production will go down. D. Floc levels will diminish.
The genome of which of the following types of animal virus can act directly as mRNA?
A) retroviruses B) +ssRNA viruses C) -ssRNA viruses D) ssDNA viruses E) dsRNA viruses
All of the following are characteristics of type 2 diabetes mellitus except
a. arises most commonly in adulthood. b. caused by insensitivity of fat and muscle cells to insulin. c. often associated with obesity. d. the least common form of diabetes.