Common signs of bleeding in the upper gastrointestinal tract include all of the following, EXCEPT:
A) melena.
B) hematochezia.
C) hematemesis.
D) dark, tarry stools.
Answer: B) hematochezia.
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Which of the following statements is true regarding T cell receptors? Select all correct
A. They recognize antigen-MHC complexes. B. They contain variable and constant regions. C. They are composed of two heavy (H) chains and two light (L) chains. D. They are formed by the rearrangement of V, J, C, and D gene segments. E. They can be found in the bloodstream independent of T cells.
Some plants can tolerate flooding conditions by
A. formation of aerenchyma. B. opening their lenticels. C. forming additional adventitious roots. D. shedding their bark. E. pumping water out of their roots.
What is the portion of a dicot seedling below the cotyledons called?
A. internode B. epicotyl C. hypocotyl D. plumule E. subcotyl
High stomach acidity
a. creates ideal conditions for carbohydrate digestion. b. promotes emulsification of fats. c. favors protein digestion. d. blocks the release of histamine, thereby favoring production of peptic ulcers. e. converts lipases into their active forms.