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Thanks for stopping by, this is 2 Minute Classroom and today we are talking about purines and pyrimidines. Specifically, what they are, how they differ, and how to remember them.
Purines and pyrimidines are the two main classifications of nitrogenous bases. We’ll talk about the ones found in DNA and RNA. The purines are Adenine and Guanine. They are composed of a double ring structure and are larger than pyrimidines. The pyrimidines are Cytosine, Uracil (found only in RNA) and Thymine (found only in DNA). These all have a smaller, single ring structure.
The purines always pair with a pyrimidine, in A to T and G to C in DNA and A to U and G to C in cases where RNA pairs with itself or a complementary DNA strand.
You’ll undoubtedly encounter these terms on some exam or assignment, so I have a handy mnemonic to help you remember which bases go in which group.
Remember “Pure As Gold” for the purines A and G. And remember “CUT the Pie” for the pyrimidines C, U, and T.
You’ll probably want to come up with your own way to remember the basic structure of each, but for what it’s worth, I just knew that purine was a smaller word but had the larger double ring structure and pyrimidines was the larger word but the smaller single ring structure. Somehow that worked for me.
Watch these related videos about DNA and RNA, or this random video of mine YouTube thinks is best for you.
Thanks for the love.
