Multiple Choice
Toxic elements such as mercury are found in the human body because
A) of contamination from the environment.
B) trace amounts of these elements have vital biological functions.
C) they are needed to kill bacteria.
D) they may be ingested with food but inactivated by cells.
E) in small amounts they are biologically inactive and tolerated by cells.
Correct Answer:
Verified
Correct Answer:
Verified
Q5: A salt will dissolve in water to
Q6: MATCHING<br>Classification.The various energy levels in an atom
Q7: The atomic number refers to the<br>A) mass
Q9: In a chemical equation, the chemicals to
Q11: Which statement is false?<br>A) A molecule is
Q12: An atom with more protons than electrons
Q13: MATCHING<br>Classification.The various energy levels in an atom
Q14: Which of the following is NOT accurate
Q27: Radioactive isotopes have _.<br>A) excess electrons<br>B) excess
Q41: Tracers are elements that _.<br>A) are used