The brain and spinal cord constitute which of the following?
A. The autonomic nervous system
B. The peripheral nervous system
C. The central nervous system
D. The afferent nervous system
E. The somatic nervous system
C. The central nervous system
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The portions of an antigen to which antibodies bind are the
A) active sites. B) reactive sites. C) antigenic determinant sites. D) antibody active sites. E) antigen activation segments.
The retrovirus HIV frequently undergoes mutations, making it difficult for scientists to develop a single effective vaccine. When flu vaccines are administered, patients are told that they are only protected from one strain of the flu and are still as susceptible to other strains as unvaccinated people. Explain why.
What will be an ideal response?
Which of the following is not a component of innate immunity?
a. inflammation b. antibody production c. interferon d. natural killer cells e. the complement system
Retinaldehyde (retinal) is derived from ________.
A. opsin B. vitamin A C. vitamin C D. vitamin D