Class II MHC molecules are found _________.
A) only on granulocytes and macrophages.
B) on all cells with a nucleus.
C) only on liver cells and macrophages in the spleen.
D) only on red blood cells.
E) only on lymphocytes and macrophages.
E) only on lymphocytes and macrophages.
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Describe the two general meanings of the term membrane, as used in biology. Which usage indicates layers of cells and which indicates layers of molecules?
What will be an ideal response?
The trachea
A) is lined by dense regular connective tissue. B) is reinforced with C-shaped cartilages. C) contains the vocal cords. D) always maintains the same diameter. E) ends distally at the level of the diaphragm.
In the process of tubular secretion, ________ are moved from the ________ to the ________.
A. unwanted substances; tubular fluid; blood B. nutrients; tubular fluid; blood C. nutrients; blood; tubular fluid D. unwanted substances; blood; tubular fluid
The second step in the progression of lung cancer is the loss of cilia.
Answer the following statement true (T) or false (F)