When a message molecule binds to a receptor,
A) the message molecule enters the target cell.
B) the cell begins to grow and divide.
C) the target cell passes the message molecule to another target cell.
D) a series of chemical reactions is initiated.
D
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The UN reports that how many children die each day from unsafe water and lack of basic sanitation?
A) 4000 B) 40000 C) 400 D) 100 E) 10000
Detrital sedimentary rocks differ from chemical sedimentary rocks in that
A) detrital sedimentary rocks accumulate in depositional basins, while chemical sedimentary rocks do not B) detrital sedimentary rocks are composed of visible pieces of preexisting rocks C) chemical sedimentary rocks are composed of chemical elements, while detrital rocks are not D) chemical sedimentary rocks accumulate in the ocean, while detrital rocks do not
In general, most ecosystems in the world have
A) remained relatively unchanged for millions of years. B) been impacted by human activities. C) experienced increased ecosystem capital because of human activities. D) already been significantly harmed by global climate change.
The horizontal line that defines the portion of the anticline or syncline with the maximum curvature is known as the
A) valley. B) hinge. C) trough. D) basin.