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teddygirl
 3 years ago
Could someone please help?
1. Which of the following best identifies base 1?
purine
pyrimidine
cytosine
nucleotide
2. Which of the following could base 2 bind with?
a purine
a guanine
an adenine
a pyrimidine
teddygirl
 3 years ago
Could someone please help? 1. Which of the following best identifies base 1? purine pyrimidine cytosine nucleotide 2. Which of the following could base 2 bind with? a purine a guanine an adenine a pyrimidine

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Calliope
 3 years ago
Best ResponseYou've already chosen the best response.0One easy way to remember the difference between purines and pyrimidines is that purines (the shorter word) are larger and are tworing structures, whereas pyrimidines (a longer word) are smaller, onering structures.

InYourHead
 3 years ago
Best ResponseYou've already chosen the best response.2Okay, let me tell you WHAT exactly each base is. Base 1 is Adenine. Base 2 is Guanine. Now, you know the nucleo bases, right? Adenine, Thymine, Guanine, Cytosine. And you know how ADENINE pairs with THYMINE? And GUANINE pairs with CYTOSINE? ~~~~~~~~~~~ Now, there are two more things we have to remember: 1. ADENINE and GUANINE are PURINES. 2. THYMINE and CYTOSINE are PYRIMIDINES. So, the two bases in your picture are both PURINES, because they are ADENINE and GUANINE. ~~~~~~~~~~~~~ Now, the answer to #1 is Purine, since Adenine isn't one of the choices. Now, look at #2. It's guanine. What does guanine pair with? Cytosine. And what is cytosine? It's a pyrimidine. So there, #2 would be a pyrimidine. ~~~~~~~~~~~~~~ Calliope made a good point. Just remember that Purines bind with Pyrimidines. And remember.... 1. Adenine and Guanine are PURINES. 2. Thymine and Cytosine are PYRIMIDINES.

Calliope
 3 years ago
Best ResponseYou've already chosen the best response.0Oh yeah, I have a couple of tips for figuring out what base it is when you just see the structure: First of all, G and A are the purines, i.e. the big tworing structures. Just think about ATP and GTP  two very important energystoring molecules that you'll hear about a lot. To remember which bases have an NH2 instead of a double bond O sticking out the top, the mnemonic I used is "CAN". Cytosine (C) and Adenine (A) have NH2.
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