During DNA replication, which nucleotide will bind to an A nucleotide in the original or parental DNA strand?

Answer 1

Nucleotide one with T base.

In DNA Adenine(A) pairs up with its complementary base Thymine(T).
So during the replication DNA polymerase ( an enzyme ) makes sure that to the base A of parental nucleotide, the nucleotide with base T binds.

If you are getting confused with Uracil (base U), this base only occurs in RNA instead of base T and you do not have to consider it during DNA replication.

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Answer 2

Daniel Arnold

During DNA replication, a T nucleotide will bind to an A nucleotide in the original or parental DNA strand.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.