DNA strand telomere, TEM

DNA strand telomere, TEM

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Credit: DR GOPAL MURTI/SCIENCE PHOTO LIBRARY

Caption: DNA strand telomere. Coloured transmission electron micrograph (TEM) of the end of a strand of DNA (deoxyribonucleic acid), or chromosome. The end of a chromosome is known as the telomere. It consists of short repeated sequences of DNA and proteins, and is looped. The loop structure prevents the end of the chromosome being eroded by enzymes present in the cell nucleus and prevents enzymes from joining two chromosomes together. Telomeres play an important role in cellular aging. As cells replicate and age the telomere steadily shrinks. When the telomere reaches a certain length the cell stops dividing and dies.

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Keywords: biochemical, biochemistry, biological, biology, cellular aging, chromosome, coloured, complex, deoxyribonucleic acid, dna, end, false-coloured, genetic, genetics, loop, looped, nucleoprotein, short repeat, strand, telomere, telomeric, tem, transmission electron micrograph, transmission electron microscope

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