A double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA.
Imagine a twisted ladder or spiral staircase. The steps you climb are like the base pairs, while the rails on either side represent the sugar-phosphate backbone.
Nucleotide: The basic building block of nucleic acids such as DNA and RNA.
Chromosomes: Thread-like structures located inside the nucleus of animal and plant cells that carry genes made from long strands of DNA.
Genes: Segments within a chromosome that contain instructions for making specific proteins.
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