Answer:
The answer is Atom.
Explanation:
The atom is the smallest constituent unit of matter that has the properties of a chemical element and that it is not possible to divide by chemical processes. The atom is formed by a nucleus with protons and neutrons and several orbital electrons (subatomic particles); whose number varies according to the chemical element. Atoms combine to form molecules that then interact to form solids, liquids and gases.
The only effective methods to prevent oxygen toxicity are to limit the pO2, the time of exposure, and to give air breaks during oxygen breathing
Answer:
The correct answer is - Mutation in particular DNA segments can lead to the loss of apoptotic control which allows the cancerous or damaged cells to survive longer.
Explanation:
An error or change in a DNA segment or DNA repair gene mistakes become mutations if not corrected. These mutations may lead to change in the function of the specific functions that may lead to cancer. Such mutations are tumor suppressor genes or oncogenes. The activities of genes regulate the signal when they detect damaged cells and such cells should undergo apoptosis (programmed cell death).
The loss of apoptotic control by a mutation in such genes allows cancer cells to not follow apoptosis and leads to survival for a longer time and allow them to divide, accumulate and proliferate.
