There are currently 8,614,790 lane miles of road in the lower 48 states. The average width of a highway lane is 11 feet. This means roads cover 17,947 square miles of land, or just six-tenths of 1 percent of the total land area of the contiguous 48 states.
Role of the centrosome in cell cycle progression. Centrosomes are associated with the nuclear membrane during prophase of the cell cycle. In mitosis the nuclear membrane breaks down and the centrosome nucleated microtubules (parts of the cytoskeleton) can interact with the chromosomes to build the mitotic spindle.he centrosome replicates during the S phase of the cell cycle. During the prophase in the process of cell division called mitosis, the centrosomes migrate to opposite poles of the cell. The mitotic spindle then forms between the two centrosomes. Upon division, each daughter cell receives one centrosome.
Within an animal cell centrosome there â¦ is a pair of small organelles, the centrioles, each made up of a ring of nine groups of microtubules.    There are three fused microtubules in each group. The two centrioles are arranged such that one is perpendicular to the other.   During animal cell division, the centrosome divides and the centrioles replicate (make new copies). The result is two centrosomes, each with its own pair of centrioles.he centrioles are perpendicular to each other. They are important in the organization on the cell. Their most important role in a cell is when the cell divides.