1 point 2. A researcher adds an enzyme to a sample of human DNA to see if the
DNA changes. Which result would best support the conclusion that the
enzyme had no effect on the DNA?
The DNA has uracil bases.
The DNA has unpaired nitrogenous bases.
The DNA has a single strand with nucleotides and a sugar-phosphate backbone.
The DNA has a double helix shape with nucleotide pairs and sugar-phosphate
backbones.

has a single strand with nucleotide and a sugar phosphate backbone

hi

i'm not really sure but i think its the second option

Explanation:

enzymes when they are active usually hydrolyzes things

so in the second one we read that we can see unpaired nitrogenous bases

these bases are:

adenin timin citosin goanin

those are for DNA . in RNA timin is changed with uracil

so these means the hydrogen bond between them are hydrolyzed by enzyme

so we see the effect of enzyme on DNA