THE MOLECULAR BASIS OF INHERITANCE
DNA REPLICATION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Helicase adds new nucleotides to both strands
|
|
|
In each of the resulting molecules, one strand is old, and the other is new
|
|
|
There are three copies made from the original molecule
|
|
|
Each strand of a DNA molecule is oriented in a different direction; one up, one down
|
Detailed explanation-1: -This process is known as semi-conservative replication because two copies of the original DNA molecule are produced, each copy conserving (replicating) the information from one half of the original DNA molecule. Each copy contains one original strand and one newly-synthesized strand.
Detailed explanation-2: -Semiconservative replication is so named because one of the strands of DNA in each of the two copies of DNA is ancient and conserved while the other is newly produced at the moment of replication.
Detailed explanation-3: -One of the most important concepts of DNA replication is that it is a semi-conservative process (Figure 7.2. 7). This means that every double helix in the new generation of an organism consists of one complete “old” strand and one complete “new” strand wrapped around each other.
Detailed explanation-4: -This process is said to be ‘semiconservative’ because one strand from each parent is conserved and remains intact after replication has taken place.
Detailed explanation-5: -Each new DNA molecule contains one strand from the original molecule and one newly synthesized strand. The term for this mode of replication is “semiconservative, ” because half of the original DNA molecule is conserved in each new DNA molecule.