Question

dna contains instructions for making proteins, but dna is confined to the nucleus. rnas job is to copy instructions from dna and carry them to other parts of the cell. 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 nucleotides. according to the rules of complementary base - pairing, pairs with thymine, and guanine pairs with. uracil pairs with. but rna contains the nitrogenous base uracil instead of.

Explanation:

DNA contains instructions for making proteins and is confined to the nucleus. RNA is created in the nucleus using a section of DNA as a template. First, the DNA's hydrogen - bonds are broken to split 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. Since RNA does not contain thymine, uracil pairs with adenine. Guanine pairs with cytosine, and uracil pairs with adenine in RNA instead of thymine as in DNA.

Answer:

First, a section of the DNA molecule is "unzipped" by breaking the hydrogen bonds to split it into two strands. Then, RNA nucleotides are brought in to pair with the DNA nucleotides according to the rules of complementary base - pairing. Since RNA does not contain thymine, uracil pairs with adenine, guanine pairs with cytosine, and uracil pairs with adenine. RNA contains the nitrogenous base uracil instead of thymine.