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which of the following best describes a telomere? a. a region of intensely staining proteins dispersed throughout chromosomes that are actively being transcribed b. a protein-based structure found in the cytoplasm associated with controlling cell division c. a single stretch of dna that codes for nucleic acid polymerases d. a repetitive sequence found on the ends of chromosomes e. a dna sequence that codes for cytoskeletal proteins associated with intracellular communications

Sagot :

A chromosome's end contains a stretch of repeating DNA sequences known as a telomere. Chromosome ends are shielded from fraying or tangling by telomeres. The telomeres get a little bit shorter every time a cell divides.

Our somatic cells only contain very little amounts of telomerase. These cells age and lose their ability to operate normally because they do not use telomerase on a regular basis. Does the germline contain high quantities of telomerase? cells, including stem cells and egg and sperm. After DNA replication, the telomere length in these cells is preserved, and the cells do not age. Does cancer also have high quantities of telomerase? cells. Cancer cells can become immortal and keep growing as a result. If the telomerase activity changed.

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