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19. Which type of bond holds the sugar-phosphate backbone of a single DNA strand together?
18. Why is the antiparallel orientation of DNA strands critical?
17. Adenine and thymine in DNA are connected by how many hydrogen bonds?
16. How many hydrogen bonds are formed between guanine and cytosine?
15. Which of the following statements is true about complementary DNA strands?
14. When reading DNA sequences, which direction is used conventionally?
13. What does it mean that DNA strands are antiparallel?
12. The phosphodiester bond provides which of the following features to DNA and RNA?
11. In a phosphodiester linkage, the phosphate group forms ester bonds with which atoms?
10. What type of bond links successive nucleotides in DNA and RNA?
9. In a pyrimidine nucleotide, the sugar attaches to which nitrogen of the base?
8. In a purine nucleotide, the N-glycosidic bond attaches the sugar to which nitrogen of the base?
7. In nucleotides, the nitrogenous base is attached to the sugar via which type of bond?
6. Both DNA and RNA sugars exist in which form?
5. Which sugar is found in DNA?
4. Which of the following pyrimidine bases is found only in RNA?
3. Which of the following are purine bases?
2. What distinguishes a nucleoside from a nucleotide?
1. Which of the following correctly describes a nucleotide?
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