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Question:
Select all that apply — Which of the following statements are true regarding the DNA structure?
Multiple Choices:
A. The nitrogenous bases face the inside and hold the two backbones together with hydrogen bonds.
B. The basic three-dimensional structure of DNA is the double helix.
C. Each sidepiece is a sugar-phosphate backbone composed of phosphate groups alternating with the sugar deoxyribose.
D. Hydrogen bonds can form either between two purines or else between two pyrimidines.
ANSWER:
Correct Answers:
✅ A. The nitrogenous bases face inward and pair via hydrogen bonds.
✅ B. DNA’s 3D structure is a double helix.
✅ C. The backbone is alternating deoxyribose and phosphate.
