The structural framework of a blood clot is formed by ________.
A. a thrombin polymer
B. soluble fibrin
C. soluble fibrinogen
D. a fibrin polymer
E. a fibrinogen polymer
Answer: D
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T cells and B cells can be activated only by
A) pathogens. B) interleukins, interferons, and colony-stimulating factors. C) cells infected with viruses, bacteria, or cancer cells. D) exposure to a specific antigen at a specific site in a plasma membrane. E) disease-causing agents.
Which statement accurately describes the effects of substrate and enzyme concentrations on reaction rate?
A. An increase in either substrate or enzyme concentration will increase the reaction rate. B. An increase in either substrate or enzyme concentration will decrease the reaction rate. C. An increase in substrate concentration increases the reaction rate, but enzyme concentration has no effect. D. A decrease in substrate concentration or an increase in enzyme concentration increases the reaction rate. E. An increase in substrate concentration or a decrease in enzyme concentration will increase the reaction rate.
________ is the extracellular component of connective tissues.
Fill in the blank(s) with the appropriate word(s).
The pharynx connects to the trachea via the ____
a. esophagus b. larynx c. bronchus d. glottis