Why are some body cells responsive to a particular hormone, whereas others are not?
A. Responsive cells express a specific
receptor for the hormone.
B. Responsive cells are located closer to the
gland that releases the hormone.
C. Whether or not a cell responds to a
hormone depends entirely on what type of
cell it is (liver cell vs. fat cell vs. nerve cell)
because hormones only activate one type of
cell.
D. Responsive cells have complex signal
transduction pathways, whereas cells that do
not respond to a particular hormone lack
these pathways.
E. All of the answer options are correct.
A
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Protection of the embryo is a major requirement for land plants given there is no aquatic environment in which to keep it safe from desiccation and other environmental hazards. Which structure, in both seed and seedless plants, provides the protection and nutrients needed by the embryo as it develops?
a. sporangium b. gametangia c. female gametophyte d. archegonium
Kuru is a degenerative disease of the central nervous system believed to be caused by which type of agent?
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They measured the concentration of NH4+, NO2-, NO3-, and O2 in the Black Sea as a function of water depth (M. Kuypers et al. 2003 Anaerobic ammonium oxidation by anammox bacteria in the Black Sea. Nature 422:608-11 ) to determine where in the sea the bacteria might live. Analyzing data presented in the figure above, at what depth would you expect to find the bacteria? (Note: In the figure, different scales are used to show concentrations of NH4+, NO2-, NO3-, and O2.) A) in the top 50 meters B) at a depth of 75 meters C) at a depth of 92 meters D) below 100 meters
An ecosystem contains
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