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.
Centrosomes are made of a pair of centrioles and other proteins. The centrosomes are important for cell division and produce microtubules that separate DNA into two new, identical cells. Cilia and flagella also use centrioles, but for the purpose of cell movement, and to move liquids around cells.entrioles are also used in the cell structures cilia and flagella. Cilia are lots of small projections on cells, like little hairs that whip back and forth to move the cell or move material over or around the cell. Cells in the lungs, for example, use cilia to move mucus out of the lungs.