Athymine base in an incoming nucleotide spontaneously tautomerizes into the enol form just when it is being added to the growing nucleotide chain during dna replication. this tautomeric change is not stable, and the t returns to the keto form before the next round of dna replication. what nucleotide change will occur? for the answers below the nucleotide to the left is on top, i. e. a-t would be a on the top and t on the bottom.
a-t to c-g
a-t to g-c
o c-g to a-t
oc-g to t-a

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )