The letter "F" in the accompanying figure represents ____
a. complement
b. MHC markers with antigen expressed to the surface of a cell
c. lysosome fusing with a phagosome
d. plasma membranes fusing
e. MHC recycling
ANSWER: b
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The spur-and-groove formation of coral reefs is used as a means of:
a. obtaining more sunlight. b. dissipating the energy of the waves. c. ensuring good circulation. d. capturing more zooplankton. e. directing fish migrations.
What function do estuaries play in commercial fisheries? a. They provide mating grounds
b. They provide temporary shelter for adults. c. None of these choices. d. They serve as a nursery to juveniles.
Persons having an XXY karyotype are nearly normal males but produce few or no sperm. They have
__________ syndrome. a. Turner b. Klinefelter c. Down (trisomy form) d. Phenylketonuria e. Down (translocation form)
One-millionth of a meter is called a
A) centimeter. B) decimeter. C) micrometer. D) millimeter. E) nanometer.