Which of the following statements about eukaryotic...

Name: Problem 12, Chapter 12: Biology
Uploaded: 2021-07-27T05:22:33-08:00
Duration: 3 min 26 s
Channel: Dr. Seema Kelotra
Description: Which of the following statements about eukaryotic chromosomes is false? (a) eukaryotic chromosomes have free ends (b) telomeres contain protein-coding genes (c) telomerase lengthens telomeric DNA (d) telomere shortening may contribute to cell aging (e) cells with active telomerase may undergo many cell divisions

Which of the following statements about eukaryotic chromosomes is false? (a) eukaryotic chromosomes have free ends (b) telomeres contain protein-coding genes (c) telomerase lengthens telomeric DNA (d) telomere shortening may contribute to cell aging (e) cells with active telomerase may undergo many cell divisions

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Key Concepts

Eukaryotic Chromosome Structure

Eukaryotic chromosomes are linear DNA molecules found in the nucleus of eukaryotic cells. Their structure includes defined ends, which are capped by specialized structures that differentiate them from prokaryotic circular chromosomes.

Telomeres

Telomeres are repetitive, noncoding DNA sequences located at the ends of linear chromosomes. They protect the genetic data during cell division by preventing the degradation of important coding sequences and safeguarding against chromosomal end-to-end fusions.

Telomerase

Telomerase is an enzyme that replenishes telomeric DNA by adding specific nucleotide sequences to the ends of chromosomes. This activity is crucial for prolonging the lifespan of cells by counteracting the effects of telomere shortening over multiple cell divisions.

Cellular Aging (Replicative Senescence)

Cellular aging, often linked to replicative senescence, occurs when telomeres progressively shorten with each cell division. Once they reach a critical length, the cell can no longer divide, which contributes to the aging process at a cellular and organismal level.

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