Antigen presenting cells
A. include macrophages.
B. engulf and modify antigen to be more immunogenic.
C. include dendritic cells.
D. hold and present processed antigen on their cell membrane surface.
E. All of the choices are correct.
Answer: E
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A) cells with more than one nucleus B) cells that are unusually small C) cells lacking nuclei D) destruction of chromosomes E) cell cycles lacking an S phase
People do not develop a secondary immune response to influenza because
A) the immune system mutates from season to season. B) secondary immune responses are only possible against bacteria. C) the primary immune response is sufficient to protect against flu. D) the causative viruses mutate each season.
What problems are associated with desalination?
What will be an ideal response?
At the end of the ________ period, over 96% of marine species and many terrestrial species became extinct, possibly because intense volcanic activity warmed Earth's climate
A) Quaternary B) Permian C) Cretaceous D) Devonian