The pigment in hemoglobin contains the
mineral ___ to which oxygen binds.
a. magnesium
b. iron
c. calcium
d. copper
e. zinc
B
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According to the theory of endosymbiosis, ________ were once free-living prokaryotic organisms
a. mitochondria and chloroplasts b. all of the choices c. ribosomes d. the nucleus and endomembrane system
In 1977 Dr. Robert Ballard and J.F. Grassle discovered
a. underwater seamounts. b. the midocean ridge. c. the Titanic. d. rift communities. e. the Andrea Doria.
Where in the lymph node do the T cells first encounter antigens presented by dendritic cells?
What will be an ideal response?
Edema is defined as a collection of fluid in an area of the body. What is the physiological change that causes edema?
A) activation of complement B) increased permeability of blood vessels C) constriction of blood vessels D) fever