<span>Cells control cell division in order to maintain normal cell function. If something happens to the control of the cell division, the healthy cells will divide uncontrollably. These new cells are cancer cells. </span>
The mutations in three genes are responsible for development of cancers:
1. Mutation in proto-oncogenes. Proto-oncogenes normally signal cells to grow and differentiate. Proto-oncogenes can become oncogenes due to mutations which result in the uncontrollable division of the cells.
2. Mutation in tumor suppressor genes. In normal cells, tumor suppressor genes suppress genes essential for cell cycle and that way they prevent uncontrollable cell division. However, after a mutation in these genes, suppression is lost and the cell may progress to cancer.
3. Mutation in stability genes. In normal cells, they have no role either in cell death or growth, but they control mutation rate. Mutation in stability genes results in situation where all genes, including proto-oncogenes and tumor suppression genes, are more frequently mutated.
Well fishermen like to catch fish so upwelling off the coast of Peru provides lots of fish
Answer:
Photosynthesis, respiration, diffusion, osmosis
Explanation:
Homeostasis refers to the ability of an organism to maintain a stable internal state despite changes in external environment. In order to perform this process, some processes are required to be performed by the cell including:
- Photosynthesis, which is the process by which plants synthesize their food, helps the plant supply energy needed by the cell to perform it's function.
- Cellular respiration is the process of synthesizing energy (ATP) by the cell. Energy is needed by the cell for the numerous functions it carries out. Hence, cellular respiration is a homeostatic process.
- Diffusion is the process by which substance move from a region of high conc. to a region of low conc. until there is even distribution. Without diffusion, some materials cannot get into the cell, hence, it is a homeostatic process.
- Osmosis is the movement of water from a region with high water conc. to a region of low water conc. via a permeable membrane. The osmotic process is also a homeostatic one.
Answer:
Snow is precipitation in the form of ice crystals. It originates in clouds when temperatures are below the freezing point 0 degrees Celsius or 32 degrees fahrenheit.
