There are many types of fractures, but the main categories are displaced, non-displaced, open, and closed. Displaced and non-displaced fractures refer to the alignment of the fractured bone. In a displaced fracture, the bone snaps into two or more parts and moves so that the two ends are not lined up straight. If the bone is in many pieces, it is called a comminuted fracture. In a non-displaced fracture, the bone cracks either part or all of the way through, but does move and maintains its proper alignment. A closed fracture is when the bone breaks but there is no puncture or open wound in the skin.
The strands of DNA are antiparallel, meaning that they are parallel to each other, but in the opposite direction. DNA helicase opens the DNA so that both strands are exposed. During the process of replication, this double helix is unwound, and nucleotide bases are added to both strands going in the 5' to 3' direction.
DNA helicase unzip, or separate, a strand of DNA at positions  called origins. This means that the hydrogen bonds between  complementary base pairs are removed (DNA is dou â¦ ble stranded!). When they separate double-stranded DNA into single strands, it  allows each strand to be copied (replication).he job of Helicase is to unzip the DNA strand â¦ by breaking the hydrogen bonds that hold them together, and it does this by moving along the strand of DNA, very much like on an actual zipper.