Which of the following statements concerning sensory receptors is false?
a. They transduce the energy of a stimulus into electrical signals.
b. They are specialized neuron endings or specialized cells in close contact with neurons.
c. They are the main centers for integrating sensory input.
d. They depolarize in response to a stimulus.
e. They operate by opening or closing ion channels in the plasma membrane.
C
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A culture of an organism believed to cause intestinal symptoms is viewed under the microscope, and the microbiologist observes a cell membrane, flagella, mitochondria, and some dark unrecognizable structures within each cell. The microbiologist notes that the cells are eukaryotic because
A. only eukaryotic cells have flagella. B. the dark structures must be the cell nuclei. C. only eukaryotic cells have a cell membrane. D. only eukaryotic cells have mitochondria.
What is the medullary index and what does this measurement indicate?
What will be an ideal response?
What (and who) was the first reproductively cloned animal?
What will be an ideal response?
In the primary response to an antigen, the first class of antibody to be secreted is
A. IgG. B. IgE. C. IgA. D. IgM. E. IgD.