Multiple Choice
How are the nucleotides in a single polynucleotide chain linked together?
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1. Introduction to Biochemistry
Nucleic Acids
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which sugar is present in the backbone of DNA?
A
Fructose
B
Ribose
C
Glucose
D
Deoxyribose
Verified step by step guidance1
Understand the structure of DNA: DNA (Deoxyribonucleic Acid) is a molecule that carries genetic information. Its backbone is composed of alternating sugar and phosphate groups.
Identify the sugar in DNA: The sugar in DNA is a pentose sugar, meaning it has five carbon atoms. This sugar is specifically deoxyribose, which is a modified form of ribose where one oxygen atom is removed from the 2' carbon.
Compare deoxyribose with other sugars: Fructose and glucose are hexose sugars (six carbon atoms), and ribose is a pentose sugar found in RNA. Deoxyribose is unique to DNA and is essential for its structure.
Recognize the role of deoxyribose: Deoxyribose forms part of the DNA backbone by linking with phosphate groups through phosphodiester bonds. This structure provides stability and allows the DNA to store genetic information.
Conclude the answer: Based on the structural and functional characteristics, the sugar present in the backbone of DNA is deoxyribose.
