How might cancer stem cells originate? How Do Cancer Stem Cells Arise? The molecular pathways that maintain “stem-ness” in stem cells are also active in numerous cancers. This similarity has led scientists to propose that cancers may arise when some event produces a mutation in a stem cell, robbing it of the ability to regulate […]

Where is the moon during a lunar eclipse? The amount of Moon we see changes over the month — lunar phases — because the Moon orbits Earth and Earth orbits the Sun. Everything is moving. During a lunar eclipse, Earth comes between the Sun and the Moon, blocking the sunlight falling on the Moon. Earth’s […]

How important is it to explore alternative forms of energy? Fossil fuels pollute the environment but it also affects the health of wildlife and not to mention human life. The importance of alternative energy is that it can help create a healthier life than we live in today by saving our environment. Environment issues have […]

What are the limitations of population growth? Limitations to population growth are either density-dependant or density-independent. Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. What is an S curve in construction? An “S-Curve” is often used when forecasting the construction component of […]

What makes some proteins more heat stable? It has been suggested that deletion or shortening of loops may increase protein thermal stability (Russell et al., 1997, 1998). Oligomerization can be another contributing factor. These factors reflect a change in protein size, and its effect on thermal stability. What is the meaning of heat labile? In […]

What type of fibers or minerals are in the extracellular matrix of bone? Extracellular matrix, which is made up of an organic matrix (30%) containing proteoglycans (but less than cartilage), glycosaminoglycans, glycoproteins, osteonectin (anchors bone mineral to collagen) and osteocalcin (calcium binding protein). There are collagen fibres (mostly type I (90%), with some type V). […]

What happens to the temperature of a substance while its melting? During melting, energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature. What happens to the temperature during melting […]

What are the effects of radiation on a fetus? Depending on the stage of fetal development, the health consequences of exposure at doses greater than 0.5 Gy can be severe, even if such a dose is too low to cause an immediate effect for the mother. The health consequences can include growth restriction, malformations, impaired […]

Why is the prairie dog endangered? Prairie dogs are threatened by human intolerance, disease, climate change and habitat loss. Contact your state Senators and Representatives and governors in western states and let them know that you support prairie dog and black-footed ferret recovery. Are prairie dogs active at night? Prairie dogs are active during the […]

How does the body adjust the radius of its blood vessels? The body establishes a pressure gradient for fluid due to the pressure difference between the two ends of the vessels. As viscosity increases then flow will decrease and if length of vessel increases flow decreases, if radius increase flow increases as well. What could […]