Question

1- A _______________ of DNA consists of a sugar, a phosphate, and a nitrogen containing base.

2- A ______________ is a change in the base sequence of a DNA molecule.

Answer 1

I think the first one is a nucleotide

Answer 2

1.) A nucleotide of DNA consists of a sugar, a phosphate, and a nitrogen containing base.

2.) A mutation is a change in the base sequence of a DNA molecule

Hope this helps!