Answer:
Average weight of a DNA base pair is 650 Da. And you can find the molecular weight of DNA by using a formula, no. of basepairs*650 Da.
If u take the DNA that has information to code particular protein I presume that DNA has higher molecular weight than the protein product
I think the answer is The first sentence and until the molecules in the third sentence.
Hope This Helps
This was a hard one but I did some research and I found this
Our genome has 3 billion base pairs so a naive calculation shows 3x10^36 different combinations. But that's a meaningless number. A lot of those variants would be silent mutations, i.e. changes in introns, repeated sequences, 3rd position codons, etc etc that would have no effect on the phenotype.
Hope this help