What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
A) active transport of ions into the stele
B) evaporation of water through stoma
C) the force of root pressure
D) osmosis in the root
B
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Choose the statement that does not accurately characterize associative learning
A. pairing a stimulus that leads to a specific behavior with a neutral stimulus that initially had nothing to do with the specific behavior B. a form of conditioning in which two stimuli are paired C. linking or associating a behavior with a reward D. learning that occurs in the absence of reward or punishment E. operant conditioning
Obligate intracellular parasites may be grown in special synthetic media
Indicate whether this statement is true or false.
Which of the following is a shared component of plant and animal cells?
a. ribosomes b. chloroplasts c. centrioles d. cell wall
Which type of neuron contains one axon and multiple dendrites?
a. unipolar b. pseudounipolar c. multipolar d. bipolar