Final answer:
The amount of adenine in DNA is approximately equal to the amount of uracil in RNA. Thus, if there are 121,246 adenine molecules in DNA, there would also be 121,246 uracil molecules in the transcribed RNA.
Step-by-step explanation:
Understanding DNA and RNA Base Pairing
When considering the composition of nucleic acids such as DNA and RNA, understanding the pairing between the nitrogenous bases is crucial. In DNA, adenine (A) pairs with thymine (T), while in RNA, adenine pairs with uracil (U). Chargaff's rules state that the amount of adenine is always approximately equal to the amount of thymine in DNA, and by extension, the amount of adenine would also be approximately equal to the amount of uracil in RNA.
Therefore, if a section of DNA contains 121,246 adenine molecules, and we were to transcribe this into RNA, the RNA would contain the same number of uracil molecules, assuming the section of DNA transcribed is of equal length and is fully transcribed.