Double-helix structure of DNA: DNA is composed of two strands that wind around each other in a spiral form, creating a double-helix shape. The strands are arranged in an anti-parallel manner, meaning they run in opposite directions.
Nucleotides composition: A DNA nucleotide consists of three components:
Anti-parallel strands in DNA: The two DNA strands run in opposite directions; one strand runs from the 3’ end to the 5’ end, and the other from 5’ to 3’. This orientation is crucial for DNA replication and function.
Sugar-phosphate backbone formation: The deoxyribose sugar of one nucleotide is covalently bonded to the phosphate group of the next nucleotide, forming a continuous chain. This creates the structural framework of DNA, known as the sugar-phosphate backbone.
1. How does the anti-parallel orientation of DNA strands influence its biological function?
2. Which enzyme is responsible for synthesizing new DNA strands during DNA replication?
3. Who is credited with proposing the Polymerase Chain Reaction (PCR) technique?
DNA double-helix — structure?
Two anti-parallel strands wound in a spiral.
Nucleotides — components?
Deoxyribose, organic base, phosphate.
Anti-parallel strands — significance?
Crucial for replication and function.
Sugar-phosphate backbone — formation?
Covalent bonds between sugars and phosphates.
Base pairing — rules?
A-T and C-G via hydrogen bonds.
DNA unwinding — enzyme?
Helicase unwinds the double helix.
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