What is the difference between negative feedback and positive feedback mechanisms?
A. Negative feedback mechanisms return a
system to a set point; positive feedback
mechanisms amplify a response.
B. Negative feedback mechanisms move
away from a set point; positive feedback
mechanisms stabilize toward a set point.
C. Negative feedback mechanisms stabilize a
system toward a set point; positive feedback
mechanisms change the set point.
A
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The diversity of terrestrial vascular plants has increased almost continuously since the ____ period
a. Devonian b. Ordovician c. Cambrian d. Silurian e. Proterozoic
Which stramenopiles are photosynthetic?
a. diatoms only b. brown algae only c. water molds only d. diatoms and brown algae only e. diatoms, brown algae and water molds
Fire can move, grow, reproduce, use energy, consume oxygen, and interact with its environment. Why is it not alive?
A) It does not have cells. B) It does not consist of complex, well-ordered structures. C) It does not pass on genes for traits to its offspring. D) All of the above are correct.
Which of the following toxins produced by Bordetella pertussis results in the accumulation of excess mucus in the trachea?
A) pertussis toxin B) adenylate cyclase toxin C) tracheal cytotoxin D) both adenylate cyclase toxin and tracheal cytotoxin E) both pertussis toxin and adenylate cyclase toxin