A molecule made of a nitrogen base, sugar, and a phosphate

DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base.

They also have four types of nitrogen bases that are adenine, thymine, guanine, and cytosine aka (A), (T), (G), and (C)

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

i believe it is c.) 1575 j.