Cephalization refers to ____.
A. a type of symmetry
B. neurons concentrated at the posterior end of an animal
C. a net of neural cells
D. neurons dispersed throughout the body
E. neurons concentrated at the anterior end of an animal
Answer: E
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Would you expect a xerophilic organism to be halotolerant? Why or why not?
What will be an ideal response?
Activity of the neurotransmitter acetylcholine is brief because it
A) "self-destructs" shortly after leaving the presynaptic neuron. B) is transported back into the presynaptic neuron. C) diffuses out of the synaptic cleft. D) is pumped out of the synaptic cleft by the sodium-potassium pump. E) is rapidly broken down by enzymes in the synaptic cleft.
The way the tendons in the legs of a kangaroo aid in locomotion is most like
A) stepping in mud and the mud spreading out as your foot sinks in. B) stretching and contracting a rubber band. C) the circular movements of the wheels of an automobile. D) smashing an apple to make applesauce.
The entire genome of an organism is present in each of its cells, for example, in neurons, muscle cells, and skin cells in mammals.
Answer the following statement true (T) or false (F)