The backbone of DNA is alternating ____ and _____.

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Study for the UCF Biomedical Exit Exam. Access flashcards and multiple-choice questions with detailed hints and explanations. Prepare for success!

Multiple Choice

The backbone of DNA is alternating ____ and _____.

Explanation:
DNA’s backbone is a repeating chain of sugar and phosphate groups linked by phosphodiester bonds. Each nucleotide contributes a deoxyribose sugar and a phosphate; the bases sit on the sugar but do not form the backbone themselves. The sugar-phosphate connection runs along the length of the strand, giving it directionality (5′ to 3′) and a stable, negatively charged framework. The bases then pair internally between strands (A with T, G with C) to encode genetic information. Amino acids belong to proteins, bases are the informational components, and nucleotides are the individual units—only the sugar and phosphate form the backbone.

DNA’s backbone is a repeating chain of sugar and phosphate groups linked by phosphodiester bonds. Each nucleotide contributes a deoxyribose sugar and a phosphate; the bases sit on the sugar but do not form the backbone themselves. The sugar-phosphate connection runs along the length of the strand, giving it directionality (5′ to 3′) and a stable, negatively charged framework. The bases then pair internally between strands (A with T, G with C) to encode genetic information. Amino acids belong to proteins, bases are the informational components, and nucleotides are the individual units—only the sugar and phosphate form the backbone.

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