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<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.
Your heart pumps blood so it can circulate to your tissues as well as get oxygen from your lungs, if your heart can’t pump blood well i.e. heart attack you can feel short of breath
Answer:
Determine if the limiting factors listed below are density-dependent or density-independent?
food is density-dependent
Number of mates is also density-dependent
Habitat is density-dependent
a hurricane is density-independent
Hunting by humans is density-independent
Industrial pollution is density-dependent
Explanation:
The above limiting factors shows some density-dependent while one is density-independent. Food, habitat, and industrial pollution all depends on population as the lesser the population the smaller the limiting factors caused while hurricane and hunting by humans are density-independent.
Food, Habitat, Number of mates, and industrial pollution are all limiting factors that solely depends on density as the increase in density affects it greatly while hurricane and hunting by humans has nothing to do with increase or decrease in density, hence, they are density-independent
