Erica needs to increasingly consume more cocaine to get the same effect. She is exhibiting
A) tolerance.
B) dependence.
C) paranoia.
D) suicidal ideation.
A) tolerance.
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During the initiation of nitrogen-fixation nodules, the Rhizobium bacteria release what type of molecules to signal the host plant?
A. sugars B. proteins C. transcription factors D. flavonoids E. Nod factors
A __________ is a chemical messenger that binds to receptors on a cell and brings about
metabolic, physiological, or behavioral responses in the organism.
a. hormone b. enzyme c. nucleus d. growth factor
Prokaryotes reproduce using a method called ________.
Fill in the blank(s) with the appropriate word(s).
Kidneys are thought to have evolved first among the ________.
A. reptiles B. saltwater bony fishes C. mammals D. amphibians E. freshwater bony fishes