객관식
Which type of biomolecule is DNA?
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4. Biomolecules
Nucleic Acids
객관식
Which substances compose the backbone of DNA?
A
Nitrogenous bases and ribose sugar
B
Fatty acids and deoxyribose sugar
C
Deoxyribose sugar and phosphate groups
D
Amino acids and phosphate groups
검증된 단계별 안내1
Understand the structure of DNA: DNA is a double helix composed of two strands. Each strand is made up of repeating units called nucleotides.
Identify the components of a nucleotide: A nucleotide consists of three parts: a phosphate group, a sugar molecule (deoxyribose in DNA), and a nitrogenous base.
Focus on the backbone of DNA: The backbone is formed by alternating deoxyribose sugar and phosphate groups, connected by covalent bonds. This structure provides stability and support to the DNA molecule.
Clarify the role of nitrogenous bases: Nitrogenous bases (adenine, thymine, cytosine, and guanine) are not part of the backbone. They are attached to the sugar molecules and form the rungs of the DNA ladder through hydrogen bonding.
Eliminate incorrect options: Fatty acids, amino acids, and ribose sugar are not components of DNA's backbone. The correct answer is deoxyribose sugar and phosphate groups.
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