1 Set of hunches. 2  If a theory is a set of hunches, it means we arenât yet sure we have the answer. 3  Theories always involve an element of speculation or conjecture. 4  A theory is not just one inspired thought or an isolated idea.  A theory offers some sort of explanation.
Uracil is paired with thymine in RNA and it is paired with Adenine in DNA. In DNA transcription (from DNA to RNA), uracil pairs with adenine. in regular DNA replication adenine pairs with thymine.
Flurouracil is a drug that is similar in structure to the pyrimidine uracil. It is usually used to treat a specific type of skin cancer called superficial basal cell carcinoma and other skin ailments, including scaly or crusted lesions caused by too much sun exposure. The drug is usually sold in the form of a cream.