Which is at the beginning of a grazing food web?
A. beetles
B. detritus
C. earthworms
D. leaves
E. shrews
Answer: D
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Some present-day bacteria use a system of anaerobic respiration characterized by an electron transport chain analogous to that found in aerobic organisms. Which of the following correctly characterizes the anaerobic electron transport chain?
A. It uses oxygen as a final electron acceptor. B. It is embedded in the outer mitochondrial membrane rather than the inner mitochondrial membrane. C. It establishes a proton gradient between the cytoplasm and the extracellular fluid. D. It establishes a proton gradient between the intermembrane space and the cytoplasm. E. None of these answer options accurately characterizes the anaerobic electron transport chain.
Excellent examples of allopatric speciation can be seen:a
on islands. b. in large lakes. c. on the prairie. d. in the ocean. e. in the trees.
Which of these hormones acts in opposition to diuretics such as alcohol?
A) ADH B) glucagon C) HGH D) FSH
When direct examination of virioplankton is carried out by transmission electron microscopy, the numbers obtained are reported as ________.
A. particulate organic matter B. plaque-forming units C. virus-like particles D. viral potential