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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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
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
She will be all right, but she should avoid prolonged exposure to UV radiation in the future. Which skin cancer does she have? A) melanoma B) squamous cell carcinoma C) sebaceous carcinoma D) basal cell carcinoma
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?
Most eukaryotic cells have a membrane-bound ________ that contains the genetic material
A) nucleus B) cytoplasm C) lysosome D) plasma membrane E) cell wall