Q: Cells that undergo cell division continue to have their telomeres shortened, thus telomere shortening is associated with what life process? Read this paragraph and choose the correct option from the provided answers: Telomerase and Aging Cells that undergo cell division continue to have their telomeres shortened because most somatic cells do not make telomerase. This essentially means that telomere shortening is associated with aging. With the advent of modern medicine, preventative health care, and healthier lifestyles, the human life span has increased, and there is an increasing demand for people to look younger and have a better quality of life as they grow older. In 2010, scientists found that telomerase can reverse some age-related conditions in mice. This may have potential in [2] regenerative medicine. Telomerase-deficient mice were used in these studies; these mice have tissue atrophy, stem 2. Jaskelioff et al. , "Telomerase reactivation reverses tissue degeneration in aged telomerase-deficient mice," Nature 469 (2011): 102-7. Choices: - metabolism - reducing - reproduction - aging A:
aging

Q: What is the large muscle that extends across the bottom of the chest below the lungs called? Read this paragraph and choose the correct option from the provided answers: Mammals breathe with the help of a diaphragm . This is the large muscle that extends across the bottom of the chest below the lungs. When the diaphragm contracts, it increases the volume of the chest. This decreases pressure on the lungs and allows air to flow in. When the diaphragm relaxes, it decreases the volume of the chest. This increases pressure on the lungs and forces air out. Choices: - uterus - pectoral - abdomen - diaphragm A:
diaphragm

Q: Molecules of gas are rare in what outermost region of the planet's atmosphere? Read this paragraph and choose the correct option from the provided answers: Gas molecules are exceedingly rare in the exosphere. Choices: - ozone layer - thermosphere - ionosphere - exosphere A:
exosphere