What nucleic acid subunits are connected in a phosphodiester linkage in a polynucleotide?

검증된 단계별 안내

Understand that a polynucleotide is a polymer made up of repeating subunits called nucleotides, which are the building blocks of nucleic acids like DNA and RNA.

Recall that each nucleotide consists of three components: a phosphate group, a sugar molecule (deoxyribose in DNA or ribose in RNA), and a nitrogenous base (adenine, guanine, cytosine, thymine in DNA, or uracil in RNA).

Recognize that a phosphodiester linkage is a covalent bond that connects the 3'-hydroxyl group (-OH) of the sugar in one nucleotide to the 5'-phosphate group (-PO₄) of the sugar in the next nucleotide.

Visualize the repeating structure of the sugar-phosphate backbone in a polynucleotide, where the phosphodiester linkages form the backbone, and the nitrogenous bases extend outward from the sugar molecules.

Conclude that the nucleic acid subunits connected by phosphodiester linkages are the sugar and phosphate groups of adjacent nucleotides, forming the continuous sugar-phosphate backbone of the polynucleotide chain.

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주요 개념

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Nucleic Acid Structure

Nucleic acids, such as DNA and RNA, are polymers made up of monomer units called nucleotides. Each nucleotide consists of a sugar, a phosphate group, and a nitrogenous base. The arrangement of these components is crucial for the overall structure and function of nucleic acids.

Phosphodiester Linkage

A phosphodiester linkage is a type of covalent bond that connects the 5' phosphate group of one nucleotide to the 3' hydroxyl group of another nucleotide. This linkage forms the backbone of polynucleotides, allowing for the formation of long chains that are essential for the stability and integrity of nucleic acids.

Polynucleotide Formation

Polynucleotides are formed when nucleotides are linked together through phosphodiester bonds, creating a long chain. This process occurs during DNA replication and RNA transcription, where the sequence of nucleotides encodes genetic information. The specific order of nucleotides determines the genetic instructions carried by the molecule.