Force is mass × acceleration and it is measured in Newtons.
Mass = 3kg
Acceleration = 9m/s²
F = ma
F = 3×9
F = 27Newtons.
DNA is unzipped by helicase at the origin of replication. There are several origins of replications in eukaryotic DNA replication, while only one in prokaryotic replication.
The nervous system consists of things like the spinal cord, brain, and all the nerves that connect the sensory organs. Basically, the nervous system helps different parts of the body communicate with each other; thus leading to control of the body.