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.
Describe the role of DNA helicase, DNA polymerase and DNA ligase in DNA replication? This is from my biology homework and it isnt covered in the book believe it or not, none of these words are in the glossary and i have no idea what i'm doing. Any help would be appreciated. Describe the role of DNA helicase, DNA polymerase and DNA ligase in DNA replication. Follow. Report Abuse.