The nitrogenous waste in mollusks is removed by
A. flame cells.
B. nephridia.
C. Malpighian tubules.
D. incurrent siphon.
E. flagella.
B. nephridia.
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In negative control, a gene is switched off when _____
A) a kinase adds a phosphate to DNA B) lactose is transported into the cell C) a regulatory protein binds to DNA and shuts down transcription D) a regulatory protein is removed from DNA and shuts down transcription
Match the following items with the correct phrases.
_______1. A decreased number of white blood cells in the peripheral bloodstream. _______2. Increase in the diameter of blood vessels; an initial event in inflammation. _______3. An increased number of white blood cells in the peripheral bloodstream. _______4. Considered to be the first phase of phagocytosis; the means by which phagocytic cells are attracted to sites where they are needed. a. chemotaxis b. leukocidin c. leukocytosis d. leukopenia e. vasodilation
If R inhibits the enzyme catalyzing the M to N reaction, we call this
a. allosteric activation. b. allosteric inhibition. c. noncompetitive inhibition. d. competitive inhibition. e. either c or d, dependent on more information.
The thin, sheetlike basal laminae are found
a. under epithelia. b. in the cytoplasm just below the plasma membrane. c. in the extracellular space surrounding all eukaryotic cells. d. in between adjacent cells connected by gap junctions.