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A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

ScienceOne small ahaBiology concept

Two intertwined strands form this usual shape of DNA.

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ScienceOne small aha
Your new ahaDouble helix

DNA's two strands run in opposite chemical directions. Source: Double helix ↗

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More from Biology Basics

A few more worth knowing.

  1. 33This hereditary unit is a DNA sequence that contributes to a functional product.RECALL
    Gene

    Genes are segments of DNA

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  2. 34This term names an alternative version of a gene.RECALL
    Allele

    Different alleles can affect a trait

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  3. 35This term describes an organism's genetic makeup.RECALL
    Genotype

    It describes its alleles

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