Strep throat can develop from an infection by the bacterium Streptococcus pyogenes. After infection by this bacterium, cells in the body will respond by producing antibodies against the bacterium and the toxins it produces
What type of immune response is being described in this situation? A) cytotoxic T cell response
B) helper T cell response
C) B cell response
D) inflammation
C
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Which of the following represents the last of the nonmodern humans?
A. Cro-Magnon B. Neanderthals C. Homo ergater D. Homo habilis
Fossils of plants found in deeper geologic layers do not show vascular tissues, while fossils in shallower geologic layers include some specimens with and some without vascular tissues. Thus, vascular tissue in plants is considered a ____ character.
a. ancestral b. mosaic c. primitive d. derived e. physiologically essential
. An example of a biofilm is ____
a. oral bacteria living on teeth b. a bacterial capsule c. elongated pili d. an oil slick e. microalgae on a pond surface
Lancelets are:a
carnivores. b. filter feeders. c. parasites. d. herbivores. e. algae feeders