Question

rna is created in the nucleus by using a section of dna as a template. first, the dnas hydrogen bonds are broken to split, or \unzip,\ the molecule into two strands. then, rna nucleotides are brought in to pair with the dna nucleotides according to the rules of complementary base pairing. but, since rna does not contain thymine, uracil pairs with adenine. this model shows how rna nucleotides pair with dna nucleotides. complete the paragraph to summarize how an rna molecule is created. first, a section of the dna molecule is. then, rna nucleotides are brought in to pair with the dna nucleo lengthened to the rules of complementary base pairing, pairs with tl unzipped nine pairs with. but rna contains the nitrogenous base uracil instead of. uracil pairs with.

Explanation:

The text describes the process of RNA creation. First, DNA is unzipped (split into two strands by breaking hydrogen bonds). Then, RNA nucleotides pair with DNA nucleotides. In DNA - RNA base - pairing, cytosine pairs with guanine (as in DNA - DNA pairing). RNA has uracil instead of thymine. Uracil pairs with adenine.

Answer:

First, a section of the DNA molecule is unzipped. Then, RNA nucleotides are brought in to pair with the DNA nucleotides to the rules of complementary base pairing, cytosine pairs with guanine. But RNA contains the nitrogenous base uracil instead of thymine. Uracil pairs with adenine.