The first three are the same as those found in DNA, but in RNA thymine is replaced by uracil as the base complementary to adenine. This base is also a pyrimidine and is very similar to thymine. Uracil is energetically less expensive to produce than thymine, which may account for its use in RNA.
Answer:
A.Testable hypotheses
it makes the most sense out of the rest
Cell-mediated immunity <span>provides defense against viruses, abnormal cells, and other intercellular pathogens.</span>
Answer:
Oxygen is combined with the carbon atoms left from the glucose molecule.
Explanation:
