OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They are used as a recognition site for DNA helicase to bond & begin “unzipping” the strand for replication.
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They bond the Okazaki fragments together forming a continuous replication of DNA on the lagging strand.
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When cell continually replicate, the DNA gets shorter so by adding telomeres to the ends of DNA, they extend the life of a cell.
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They help untangle the DNA strand prior to DNA helicase’s arrival to unzip the DNA strand, readying it for replication.
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Detailed explanation-1: -Telomerase is a large ribonucleoprotein complex responsible for progressive synthesis of telomeric DNA repeats (TTAGGG) at the 3′ ends of linear chromosomes, thereby reversing the loss of DNA from each round of replication.
Detailed explanation-2: -With each cell replication, the telomeres get shorter and shorter until they’re so short that your cells can no longer divide. When cells no longer divide, tissues age. However, telomeres can be rebuilt by an enzyme called telomerase to restore cell division.
Detailed explanation-3: -Every time a cell? carries out DNA replication? the chromosomes are shortened by about 25-200 bases (A, C, G, or T) per replication. However, because the ends are protected by telomeres, the only part of the chromosome that is lost, is the telomere, and the DNA is left undamaged.