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DNA is copied by breaking the hydrogen bonds keeping it together, separating itself into two complimentary strands. Lone base pairs in the nucleus attach to the now single stranded DNA, creating two identical strands of DNA.nnnlknlk A DNA molecule is copied in a process called DNA replication. During DNA replication, the enzyme helicase separates the two strands of DNA nucleotides. The nitrogen bases of the two strands of DNA nucleotides are exposed, and the enzyme DNA polymerase causes new DNA nucleotides to pair with the original, exposed nucleotides according to the base-pairing rule. The result is two identical DNA molecules, each having a new strand of DNA nucleotides, and an original strand of DNA nucleotides. This kind of replication is called semi-conservative replication.
Wiki User
∙ 9y ago
Wiki User
∙ 13y agoDNA is copied during DNA replication.
The first step of DNA replication involves the unwinding of the double helix. The enzyme helicase breaks the hydrogen bonds between the complementary base pairs of the two anti parallel strands and unwinds the DNA. The enzyme helicase starts to break the hydrogen bonds in an area with a high concentration of adenine and thymine. Adenine and thymine have two hydrogen bonds between them, while guanine and cytosine have three hydrogen bonds between them. Due to this hydrogen bonding , it takes less energy to break two hydrogen bonds between adenine and thymine than the three hydrogen bonds between guanine and cytosine.
Once this occurs the enzyme gyrase relieves the tension of the unwinding DNA strands.
The third step involves single stranded binding proteins. These proteins anneal to the DNA strands to keep the two strands from re-annealing to each other.
In the fourth step RNA primers are are laid by the enzyme primase. DNA replication cannot occur without the RNA primers. The RNA primers give the enzyme DNA polmerase III a place to start replication.
In the fifth step the replication starts by the enzyme DNA polymerase III. The enzyme DNA polymerase III replicates the leading strand continuously towards the replication fork and the lagging strand, which is composed of short fragments, called Okazaki fragments, discontinuously away from the replication fork.
Next the enzyme DNA polmerase I removes the RNA primers and the enzyme ligase attaches the OKazaki fragments.
Once DNA polymerase III reaches the end of the strands, DNA replication is almost complete. The strands go through the process of repair to correct errors such as mismatching of nucleotides. Once the repair process is complete DNA replication is finished.
Wiki User
∙ 7y agoduring replication a DNA molecule is split down the middle where the bases meet. The bases on each side of molecule are used as a pattern for new strand. As the bases on the original molecule are exposed complementary nucleotides are added to each side of the ladder. Two DNA molecules are formed . Half of the molecules is old DNA and half is new DNA.
Wiki User
∙ 11y agogfghghgj
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What are the uses of DNA cloning in Forensic Science?
To produce enough copies of a DNA sample, that identification can be made of the source of the DNA sample.
If you compare the original DNA to the two copies that are made after replication occurs what would you find?
Unless mutation occur the two copies of DNA that are made after replication are identical to its original form. Thus continuous replication of DNA in the chromosomes does not alter its nature.
What is a method of making any copies of DNA?
Polymerase chain reaction (PCR) is the method of making copies of DNA.
True or false cell increases in size it usually makes extra copies of its DNA?
A cell does not make "extra copies" of DNA. Through a persons life, DNA can only be copied so many times. The only time DNA does "copy itself" would be if a new cell is needed. For example, your skin cells die all the time and are shedded off from your skins surface. Your skin then is going to get to the point where more cells are going to be made. The DNA replicating process is what starts the process of cell mitosis (making more cells). All the DNA in your body is used, so a cell does not make extra copies of DNA. If the DNA gets destroyed, that cell dies and is replaced by another.
Why did the invention of PCR make DNA fingerprinting?
PCR made it possible to produce enough copies for reliable tests.
How many copies of DNA are made?
2
Process by which DNA copies itself?
Replication! 1) DNA splits 2) DNA copies 3) left with 2 copies of DNA! :)
What is amplification when referring to DNA synthesis?
Amplification is the production of many copies of a particular DNA segment. The copying repeats - so that copies of the copies are made. This results in many, many copies in only a few cycles. PCR (Polymerase Chain Reaction) is the most common method of amplifying DNA.
What are the uses of DNA cloning in Forensic Science?
To produce enough copies of a DNA sample, that identification can be made of the source of the DNA sample.
If you compare the original DNA to the two copies that are made after replication occurs what would you find?
Unless mutation occur the two copies of DNA that are made after replication are identical to its original form. Thus continuous replication of DNA in the chromosomes does not alter its nature.
Messenger RNA copies a code from what?
it copies a code from the DNA
Which types of RNA copies DNA's instructions In the nucleus?
Messenger RNA (mRNA) copies DNA's instructions in the nucleus.
What is a method of making any copies of DNA?
Polymerase chain reaction (PCR) is the method of making copies of DNA.
What is one way that can occur in a DNA sequence?
Mutations (point mutations, inversions, translocations...) cause changes in DNA Simply stated, a mistake made while DNA copies causes changes in DNA.
During DNA replication what?
DNA replication produces two copies of the DNA.
What the two copies of chromosomes are called?
Chromosomes are roughly made up of proteins and DNA
When DNA copies itself what is this process called?
DNA Replication :)
