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Why are the new molecules of DNA both identical to the original molecule and to each other?
Wiki User
∙ 8y ago
First, we have to consider the structure of the DNA molecule. It's consists of an unbranched chain composed by four types of subunits. These subunits are called deoxyribonucleotides and are composed by a sugar (deoxyribose), a phosphate group, and a nitrogen base (adenine (A), guanine (G), thymine (T), and cytosine (C)). The deoxyribonucleotides are linked together by covalent phosphodiester bonds that join the 5' carbon of one deoxyribose group to the 3' carbon of the next one. The four kinds of nitrogen bases are attached to this repetitive sugar-phosphate backbone almost like four kinds of beads strung on a necklace.
The model to explain the structure of DNA was proposed by James D. Watson and Francis Crick, and is known as the Watson-Crick model. This model explain how the DNA is formed by complementary base pairs, that is, an adenine base always will be in front of a thymine, and a guanine to a cytosine, just like the "steps of a ladder", linked by hydrogen bonds, in the inner side of the DNA polymer, forming a double helix.
Based on the double helix model, the two strands are identical in sequence but in different direction, while one strands goes from 5' to 3' direction (of the deoxyribose backbone), the "sister strand" goes in the direction 3' to 5'. Now, a process called "DNA replication" is carried on to obtain two identical DNA molecules from a previous one.
Briefly:
Replication of DNA begins with the separation of both complementary strands (by the disruption of the hydrogen bonds from nitrogen bases). Each strand acts as template for the formation of a new DNA molecule by the sequential addition of deoxyribonucleoside triphosphates by DNA polymerases enzymes. Eventually, the whole genetic information is completely duplicated so that the two complete DNA double helices are formed, each identical in nucleotide sequence to the parental DNA helix that served as template. This aspect of DNA replication is called as "semiconservative", since each daughter DNA molecule ends up with one of the original strands plus one newly synthesized strand.
Wiki User
∙ 7y ago
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True or false After replication the nucleotide sequences in both DNA molecules are identical to each other and to the original DNA molecule?
No
How do the new copies of DNA compare to the original DNA?
DNA replicates using the process called semiconservative replication. An original DNA molecule is complementary to the replicated molecule, which means that they are identical copies of each other.
If a water molecule is neutral why does it attract polar molecules?
A water molecule is polar, which is why it attracts other polar molecules.
What does the term monomer refer to?
A monomer is a molecule that can bond to other monomer molecules to form polymers.
When replication is complete how do the two new DNA molecules compared to each other and the original DNA molecule?
stop looking for answer number 35 for mrs. goetze or you could go with helping people who aren't! seriously! Each molecule ends up with one new strand and one original strand.
True or false After replication the nucleotide sequences in both DNA molecules are identical to each other and to the original DNA molecule?
No
What is a molecule that is almost identical to another but one will kill you and the other one won't?
They could by chiral molecules.
What is a molecule that is almost identical to one another but one will kill you and the other one won't?
They could by chiral molecules.
How do the new copies of DNA compare to the original DNA?
DNA replicates using the process called semiconservative replication. An original DNA molecule is complementary to the replicated molecule, which means that they are identical copies of each other.
Is a molecule equivalent to a molecule?
Molecules are not always equivalent to molecules, as some molecules have more atoms than other molecules, and other molecules have different kinds of atoms than other molecules.
At the end of replication each new DNA molecule is composed of?
After DNA replication, each new molecule has one strand of the original DNA molecule and the other strand is composed of new nucleic acids. This is due to the semi-conservative replication of DNA.
If a water molecule is neutral why does it attract polar molecules?
A water molecule is polar, which is why it attracts other polar molecules.
What does the term monomer refer to?
A monomer is a molecule that can bond to other monomer molecules to form polymers.
A group of atoms within a molecule that interacts in predictable ways with other molecules is called a?
A functional group is a group of atoms within a molecule that interacts with other molecules
What happens when a molecule is broken?
It breaks into other molecules or other atoms
How can heat be made?
when heat is given to molecule that molecule vibrates that vibrations passed to other connected molecules.... and heat is transferred through molecules.....
Why is a structure to its molecule important to its function?
the structure of a molecule affects how it interacts with other molecules -apex
