Telomeres, centromeres

Topic: Eukaryotic Chromosome Organization

Telomeres are the end of the chromosomes and are the capping regions. Centromeres are the points at which two sister chromatids attach.

The telomeres are present at the ends of the chromosomes that are formed due to the capping of some nucleotide sequences. This protects the DNA during replication and prevents its degradation.

The centromeres are the points at which two chromatids of a chromosome join. During replication, these sister chromatids separate from the centromeres.


Practice Questions

Khan Academy

MCAT Official Prep (AAMC)

Practice Exam 1 B/B Section Question 45

Key Points

• Telomeres are the capping ends present at the ends of the chromosomes that protect DNA during replication.

• Centromeres are the regions/points of chromosomes at which two sister chromatids join each other.


Key Terms

chromatid: one strand of chromosome

telomeres: the end of the chromosomes

centromeres: the points at which two chromatids of a chromosome join



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