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DNA is a polymer of two antiparallel polynucleotide strands forming a right-handed double helix, stabilized by hydrogen bonds and base-stacking interactions.
DNA is a double-helix polymer made of two intertwined polynucleotide chains that carry genetic instructions for living organisms and many viruses. Each chain is built from repeating nucleotides, where every nucleotide contains a deoxyribose sugar, a phosphate group, and one of four nitrogenous bases (A, T, C, or G). The sugars and phosphates form an alternating sugar–phosphate backbone, while the bases on opposite strands pair specifically through hydrogen bonds according to Watson–Crick rules: A pairs with T and C pairs with G. Because the strands are complementary, each strand stores the same biological information, which can be duplicated when the helix separates during replication. The two DNA strands run in opposite directions (antiparallel), giving each strand polarity with a 5′ end (terminal phosphate) and a 3′ end (terminal hydroxyl). The double helix is stabilized mainly by hydrogen bonding between paired bases and by base-stacking interactions between neighboring aromatic bases. DNA also contains structural features such as major and minor grooves, which provide accessible binding sites for proteins (e.g., transcription factors) that recognize specific DNA sequences. In addition, DNA can adopt different conformations (most commonly B-DNA in cells, but also A-DNA and Z-DNA under certain conditions), and its strand separation can be studied via melting behavior, which depends on factors like GC content, sequence, and length.
DNA is a polymer of two antiparallel polynucleotide strands forming a right-handed double helix, stabilized by hydrogen bonds and base-stacking interactions.
Each nucleotide contains deoxyribose, phosphate, and one of four bases (A, T, C, G); complementary base pairing (A–T, C–G) duplicates information across both strands.
Genetic information is encoded in the sequence of bases along the sugar–phosphate backbone, and DNA’s major/minor grooves help proteins bind specific sequences.
DNA can transition between double-stranded and single-stranded forms (melting) and can adopt alternative conformations such as A-DNA and Z-DNA depending on conditions.
The characteristic twisted shape of DNA formed by two intertwined polynucleotide strands around a common axis.
A DNA building block consisting of a deoxyribose sugar, a phosphate group, and one nitrogenous base (A, T, C, or G).
A covalent bond between the sugar of one nucleotide and the phosphate of the next, creating the DNA sugar–phosphate backbone.
The orientation of the two DNA strands running in opposite 5′→3′ directions relative to each other.
Specific hydrogen-bond pairing rules in DNA where adenine pairs with thymine and cytosine pairs with guanine.
The wider groove in the DNA double helix that exposes base edges more accessibly for protein binding.
The narrower groove in the DNA double helix that also exposes base edges but is less accessible than the major groove.
Noncovalent interactions between neighboring bases that significantly stabilize the DNA double helix.
The process and temperature at which double-stranded DNA separates into single strands, influenced by GC content, sequence, ionic conditions, and length.
The most common DNA conformation in cells, typically right-handed with characteristic groove dimensions and helical parameters.
“Can you explain what "DNA is a polymer of two antiparallel polynucleotide strands forming a right-handed double helix, stabilized by hydrogen bonds and base-stacking interactions." means in simple terms?”