[Solved] Why did AOL begin losing customers in the early 2000s? A) It didn't provide instant messaging. B) It couldn't keep up with the advent of broadband Internet connections. C) It didn't screen out pornographic sites. D) It merged with Time Warner. E) It merged with Google. Uracil: A nitrogen-containing base found in RNA, where it pairs with adenine and replaces thymine during DNA transcription. RNA: Ribonucleic acid is a type of nucleic acid found in every living cell, serving as a messenger that transports directions from DNA for the production of proteins. Nitrogen Bases: Organic molecules that make up the building blocks of DNA and RNA, including adenine, thymine, cytosine, guanine, and uracil. Enzymes: Natural substances that markedly enhance the rate at which virtually all intra-cellular chemical reactions occur.