Multiple choice Which of the following is found only in RNA but not in DNA? Adenine Thymine Guanine Uracil Reveal answer Fill a bubble to check yourself D Correct answer Explanation Uracil base is found only in RNA and thymine base is found only in DNA whereas adenine, guanine and cytosine bases are common in both DNA and RNA. DNA contain deoxyribose sugar instead of ribose sugar in RNA.