The backbone of a single strand of DNA consists of
Correct answer: C. alternating deoxyribose sugars and phosphate groups
- A. alternating bases and phosphate groups
- B. bases only, stacked one above another
- C. alternating deoxyribose sugars and phosphate groups
- D. alternating sugars and bases
Explanation
Phosphodiester bonds link the sugar of one nucleotide to the phosphate of the next, making a repeating sugar phosphate rail with the bases hanging off it as side groups. The bases face inward to pair with the opposite strand rather than forming the backbone.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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