Thanks for reaching out! Four days in the Cinque Terre sound wonderful. From Venice, youâre going to want to take the fast train to Florence, then switch to a train to La Spezia. The route takes 5 hours, and you can see the various options by putting in âVeneziaâ to begin and âLa Speziaâ to end on trenitalia.it.
The cell cycle is controlled by the products of two classes of genes, proto-oncogenes and tumor suppressor genes. Normally the expression of these genes is balanced. 1. Proto-oncogenes encode proteins that promote cell division (These proteins act like the gas pedal on a car.. Cyclins: a family of proteins that regulate the timing of the cell cycle. These proteins trigger cell division. Internal regulators: several proteins make sure the cell cycle does not proceed unless certain processes have happened inside the cell.
This is a lot of skin cells to replace, making cell division in skin cells is so important. Other cells, like nerve and brain cells, divide much less often. How Cells Divide. Depending on the type of cell, there are two ways cells divideâmitosis and meiosis. Each of these methods of cell division has special characteristics. One of the key differences in mitosis is a single cell divides into two cells that are replicas of each other and have the same number of chromosomes. This type of cell division is good for basic growth, repair, and maintenance. In meiosis a cell divides into two cells that have half the number of chromosomes. Reducing the number of chromosomes by half is important for sexual reproduction and provides for genetic diversity. Mitosis Cell Division