Which of the following statements DOES NOT characterize decomposers?
A. They feed on nonliving organic matter.
B. They play an important role in nutrient cycling.
C. They break down wastes.
D. They release nutrients that other organisms can use.
E. They synthesize organic molecules.
E. They synthesize organic molecules.
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Is antigenic shift alone likely to lead to influenza pandemics?
A. Yes-ONLY antigenic shift can lead to the large-scale mixing of gene elements required to produce a pandemic flu strain. B. No-ONLY antigenic DRIFT can lead to the large-scale mixing of gene elements required to produce a pandemic flu strain. C. Perhaps-but it would most likely be a mixture of antigenic shift AND drift that would result in a pandemic strain. D. No-antigenic SHIFT is responsible for changes in the hemagglutinin protein, while antigenic DRIFT is responsible for changes in the neuraminidase protein. You must have changes in both to lead to a pandemic strain.
Imagine that you are a researcher who has discovered a mutant fungus that produces extra-thick septa that allow for only minimal transfer of nutrients through them. You should expect that, when compared to the normal fungus, this mutant will
a. be extremely resistant to antibiotics used to treat bacterial infections. b. digest food more efficiently. c. grow more slowly. d. divide more rapidly. e. make more extensive use of cytoplasmic streaming.
If you drop a rubber ball, it doesn't bounce back to the height you dropped it from. This is consistent with
A. the second law of thermodynamics. B. the first law of thermodynamics. C. conversion of kinetic energy into potential energy. D. conversion of kinetic energy into entropy. E. conversion of entropy into potential energy.
Extracellular fluid includes
a. interstitial fluid. b. blood. c. lymph. d. blood and lymph, only. e. interstitial fluid, plasma, and lymph