Page 116 - The Miraculous Machine that Works for an Entire Lifetime: Enzyme

Harun Yahya

stages twice, never departing before the second checking process has

been carried out. At the same time, another polymerase enzyme com-
pletes the other half of the DNA. As all this goes on, helix stabilizing en-
zymes cling on to the ends to prevent the two strands of the DNA he-
lix from winding round one another again. Yet another enzyme inter-
venes in the renewed section to ensure that the correct, newly installed
base is firmly in place.
The enzyme editase, which enters the scene in the wake of all these

stages, again checks the separated part and checks the revisions that
have been made. Once that has been performed, an identical copy of
the original DNA is complete.
The correction process does not end here, however. You'll recall
that there was a break in the DNA strand where the correction was per-
formed. This break is repaired by the enzyme DNA ligase.
This repair is exceedingly important, since if any error occurs dur-
ing such a vital process as DNA replication, the codons in the new nu-
cleotide sequences will be disordered. With one missing nucleotide, all
the codons read in triplicate will change, and as a result, molecules will

be produced that mean nothing to the organism and the living body in
question will start to die.
Another important enzyme works inside this extraordinary sys-
tem during the synthesis of RNA from DNA. Instead of checking for in-
correct and wrongly copied bases in RNA and extracting them one by
one, this enzyme cuts base sequences out from the region like a pair of
scissors, by identifying regions in which bases have been set out incor-

rectly. If this cutting process takes place in several regions simultane-
ously, instead of in one only, the DNA strand will begin to fall apart. To
prevent this, the cell dispatches another enzyme to the region. This en-
zyme brings the divided DNA strands back together again and joins
them up. 70

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