In DNA structure, the backbone of the DNA molecule is primarily made up of which components?

• A. Nitrogenous bases linked by peptide bonds
• B. Alternating deoxyribose sugars and phosphate groups
• C. Amino acids connected by phosphodiester bonds
• D. Alternating ribose sugars and phosphate groups

Answer: (B)

Verified step by step guidance

1. Recall the basic structure of DNA, which consists of a sugar-phosphate backbone and nitrogenous bases attached to the sugars.
2. Identify the sugar involved in DNA, which is deoxyribose, not ribose (ribose is found in RNA).
3. Understand that the backbone is formed by alternating sugar and phosphate groups linked together.
4. Recognize the type of bond that connects these sugar and phosphate groups, which is the phosphodiester bond.
5. Conclude that the DNA backbone is made up of alternating deoxyribose sugars and phosphate groups connected by phosphodiester bonds.