Which enzyme is responsible for adding repeated sequences to the ends of eukaryotic chromosomes?

There are multiple origins of replication on the eukaryotic chromosome, such that replication can occur simultaneously from several places in the genome. During elongation, an enzyme called DNA polymerase adds DNA nucleotides to the 3′ end of the template.

Which enzyme adds repetitive sequences at each end of eukaryotic chromosomes?

Telomerase? is an enzyme? that adds the TTAGGG telomere sequence to the ends of chromosomes. Telomerase is only found in very low concentrations in our somatic cells?. Because these cells do not regularly use telomerase they age leading to a reduction in normal function. The result of ageing cells, is an ageing body.

Which enzyme is responsible for the addition of telomeres to eukaryotic chromosomes?

Telomerase is the enzyme responsible for maintenance of the length of telomeres by addition of guanine-rich repetitive sequences. Telomerase activity is exhibited in gametes and stem and tumor cells.

Which eukaryotic enzyme is responsible for replication of the ends of chromosomes group of answer choices?

The discovery of the enzyme telomerase (Figure 6) clarified our understanding of how chromosome ends are maintained. Telomerase contains a catalytic part and a built-in RNA template. It attaches to the end of the chromosome, and complementary bases to the RNA template are added on the 3′ end of the DNA strand.

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How does the enzyme telomerase meet the challenge of replicating the ends of linear chromosomes?

How does the enzyme telomerase meet the challenge of replicating the ends of linear chromosomes? It catalyzes the lengthening of telomeres, compensating for the shortening that occurs during replication. DNA is a self-replicating molecule.

Which of the following are short repeats of DNA on the ends of eukaryotic chromosomes?

To prevent the loss of genes as chromosome ends wear down, the tips of eukaryotic chromosomes have specialized DNA “caps” called telomeres. Telomeres consist of hundreds or thousands of repeats of the same short DNA sequence, which varies between organisms but is 5′-TTAGGG-3′ in humans and other mammals.

What activity does telomerase use to replicate the ends of chromosomes?

In Summary: Telomeres

Telomerase, an enzyme with a built-in RNA template, extends the ends by copying the RNA template and extending one end of the chromosome. DNA polymerase can then extend the DNA using the primer. In this way, the ends of the chromosomes are protected.

What happens if telomeres are too long?

It was known that very short telomeres cause harm to a cell. But what was totally unexpected was our finding that damage also occurs when telomeres are very long.” … As telomeres shorten over time, the chromosomes themselves become vulnerable to damage. Eventually the cells die.

What is the sequence composition of telomeres?

Telomeres are made up of repeated segments of DNA that consist of the sequence 5′-TTAGGG-3′ (in which T, A, and G are the bases thymine, adenine, and guanine, respectively). Some human cells contain as many as 1,500 to 2,000 repeats of this sequence at each end of each chromosome.

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How do telomeres solve the end replication problem?

Eukaryotes have solved the end-replication problem by locating highly repeated DNA sequence at the end, or telomeres, of each linear chromosome. … In prokaryotes, the end-replication problem is solved by having circular DNA molecules as chromosomes. Another cause of telomere shortening is oxidative stress.

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