Which ultratrace element is a constituent of vitamin B12?
A) arsenic
B) vanadium
C) boron
D) cobalt
Correct Answer:
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Q31: The form of fluoride in toothpaste is
Q32: Arsenic exists mostly in which forms?
A)monovalent and
Q33: Which ultratrace element is not required by
Q34: Which ultratrace element enters the cell through
Q35: Arsenic's toxicity is directly related to its
Q37: Toxicity of which element results in green
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Q39: Where might one expect to find a
Q40: Which element has a positive influence on
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