Archaeal sulfate reducers use elemental sulfur as an electron acceptor.
Answer the following statement true (T) or false (F)
False
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What causes tidal overmixing in estuaries?
a. strong tidal currents. b. strong river flow. c. an unstable water column. d. downwelling. e. animal migrations.
Vitamins that are acquired from fat-containing foods are known as
A. lipo-vitamins. B. coenzymes. C. fat-soluble vitamins. D. essential vitamins.
Sodium (Na), atomic number 11, has a tendency to lose an electron in the presence of chlorine. After losing the electron, Na has ________ protons in its nucleus
A) 11 B) 10 C) 22 D) 21 E) 12
If a T cell is exposed to a "hidden" antigen, what kind of immune reaction will result?
A) an autoimmune disease B) a delayed hypersensitivity reaction C) a cytotoxic hypersensitivity reaction D) allergic contact dermatitis E) an allergy