Hot sulfur-rich environments associated with terrestrial sulfur-rich springs are called
A) acid-mine drainage.
B) hydrothermal vents.
C) solfataras.
D) terrestrial volcanoes.
Answer: C
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Fumarate production is an oxidation reaction similar to the reactions that produce ?-ketoglutarate, and oxaloacetate, but with one key difference. What is it?
a. Fumarate production releases a water molecule. b. Carbon dioxide is released in this reaction. c. This reaction reduces FAD instead of NAD+. d. Fumarate production occurs twice per cycle.
Isotopes of an element are differentiated by their ____
a. atomic weight b. number of orbital shells
c. element name d. mass number e. electron profile
The taxonomic subdivision immediately below the level of a kingdom is a
A. phylum. B. family. C. genus. D. order.
Which is the only antibody that can cross the pla¬centa to protect a fetus before its own immune system becomes active?
A. IgA B. IgE C. IgM D. I gG E. IgD