What holds together adenine and thymine?
- Correct Answer: helium bonds
- covalent bonds
- potassium bonds
- hydrogen bonds
Explanation: The base-pairing nature of DNA. Adenine always pairs with thymine, and they are held together with two hydrogen bonds. The guanine-cytosine base pair is held together with three hydrogen bonds. Note that one sugar-phosphate backbone is in the 5’ → 3’ direction, with the other strand in the opposite 3’ → 5’ orientation. Notice that the 5'-end begins with a free (not attached to the sugar of another nucleotide) phosphate group, while the 3'-end has a free (not attached to the phosphate group of another nucleotide) deoxyribose sugar.
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