Could someone please help?
1. Which of the following best identifies base 1?
2. Which of the following could base 2 bind with?
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga.
Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus.
Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
One easy way to remember the difference between purines and pyrimidines is that purines (the shorter word) are larger and are two-ring structures, whereas pyrimidines (a longer word) are smaller, one-ring structures.
Okay, 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.
1. Adenine and Guanine are PURINES.
2. Thymine and Cytosine are PYRIMIDINES.
Not the answer you are looking for? Search for more explanations.
Oh 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 two-ring structures. Just think about ATP and GTP -- two very important energy-storing 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.