Which is NOT correct according to the best known model for a DNA molecule?
..A. Adenine pairs with thymine, cytosine with guanine.
B. It is composed of two strands made up of nucleotides.
C. The strands are held together by strong chemical bonds between the sugars.
D. The strands are twisted into a helix.

the atomic number of magnesium is 12. its nucleus must contain 12 protons and no electrons. the atomic number of an atom is determined by the number of protons.

magnesium is an electrolyte injection commonly used to treat low magnesium levels in your blood. it is also used to prevent or control seizures in women with preeclampsia or eclampsia.