X chromosome with telomeres

X chromosome with telomeres

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Credit: ALFRED PASIEKA/SCIENCE PHOTO LIBRARY

Caption: X chromosome. Computer illustration of a human X chromosome, one of the two sex chromosomes. The white cirlcles mark the areas of telomeres, the ends of the chromosome. Telomeres consist of short repeated sequences of DNA and proteins, and are 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. Chromosomes are composed of deoxyribonucleic acid (DNA) coiled around proteins. DNA contains sections, called genes, which encode the body's genetic information.

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Keywords: ageing, aging, artwork, biochemical, biochemistry, biological, biology, cellular aging, chromosome, complex, deoxyribonucleic acid, dna, end, genetic, genetics, illustration, loop, looped, medical, medicine, nucleoprotein, short repeat, strand, telomere, telomeres

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