What bases are purines?

Answer 1

Luna Chen

The two purine bases in humans are adenine and guanine.

In DNA, they pair with their complementary pyrimidine bases, thymine and cytosine, respectively.
In RNA, they pair with their complementary pyrimidine bases, uracil and cytosine, respectively.

Adenine (A) and guanine (G) look like this:

Thymine (T), uracil (U), and cytosine (C) look like this:

When we have a base pair, a purine base and its complementary pyrimidine base hydrogen-bond.

Example: AT Pair

Example: GC Pair

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Answer 2

Wyatt Atkins

Adenine and guanine are purines.

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Answer 3

Caleb Adams

The bases that are purines are adenine and guanine.

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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.