In a reflex arc, the correct sequence of cell types through which an electrical signal would pass would be
A. motor neuron ? sensory neuron ? interneuron in the PNS
B. sensory neuron ? interneuron in the CNS ? motor neuron
C. sensory neuron ? motor neuron ? interneuron in the CNS
D. motor neuron ? interneuron in the PNS ? sensory neuron
B. sensory neuron ? interneuron in the CNS ? motor neuron
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Allergy shots require many injections over long periods of time to be effective. Why can't the body get over an allergy with just a couple of injections?
What will be an ideal response?
Charlotte liked to have a suntan all of the time, so she never wore sunscreen at the beach or in the tanning salon. During a visit to her doctor, she was told that she has the most common form of skin cancer
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The evolution of many species from a single common ancestor is called
a. adaptive radiation b. punctuated equilibrium c. genetic drift d. disruptive selection e. microevolution
Most eukaryotic cells have a membrane-bound ________ that contains the genetic material
A) nucleus B) cytoplasm C) lysosome D) plasma membrane E) cell wall