Type III hypersensitivity conditions such as arthritis involve
A. the formation of immune complexes.
B. delayed, cell-mediated immune reactions.
C. a cytotoxic reaction.
D. the activation of mast cells.
E. All of the choices are correct.
Answer: A
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Which of the following is not associated with adhesive junctions?
A) desmosomes B) hemidesmosomes C) plaques D) connexin E) cadherins
Enzymes ____
a. change the rate of a reaction b. change the direction of a reaction c. change the free energy of a reaction d. are used up in a reaction e. are present in concentrations approaching their substrates' concentrations
The Cenozoic era, during which the diversity of animals living today arose, has extended from 65 mya to the present. This is approximately ___ of the geologic timescale.
A. 4% B. 15% C. 1.5% D. None of the answer choices is correct. E. 7%
An integrated set of hypotheses that together explain a broader set of observations is considered a(n)
A) experiment. B) educated guess. C) fact. D) theory.