Saturn has 62 confirmed moons of which 9 are waiting to be officially named. Saturn's largest moon Titan is bigger than both Mercury and Pluto. Titan has a very thick atmosphere which is mostly nitrogen. Earth's atmosphere is also mostly nitrogen. Saturn also has many icy moons like Mimas which has a large crater that is 1/4 the diameter of the moon, and Enceladus which has very dark material covering one side and very bright material on the other side. Some of Saturn's smaller moons help keep Saturn's rings stable by orbiting in or near the rings. These moons are called "shepherd moons" and use their gravity to keep the small ring particles in a stable orbit. Some of the gaps in Saturn's rings are caused by these moons. More moons are constantly being discovered so check the NASA Saturn site for the latest.
Natural selection. Only spiders that were more resistant to the pesticide lived through the first spraying of the pesticide, thus we're the only ones that could reproduce. This in turn made the offspring of the previous generation more resistant as well; thus making the pesticide less effective.
To test, increase the amount of substrate. If the amount of reaction changes then the enzyme has not depleted. If the amount of reaction does not change then the enzyme has completely depleted.
Cellulose is one of the most abundant natural biopolymers. The cell walls of plants are mostly made of cellulose, which provides structural support to the cell. Wood and paper are mostly cellulosic in nature. Cellulose is made up of glucose monomers that are linked by bonds between particular carbon atoms in the glucose molecule.
Every other glucose monomer in cellulose is flipped over and packed tightly as extended long chains. This gives cellulose its rigidity and high tensile strength—which is so important to plant cells. Cellulose passing through our digestive system is called dietary fiber. While the glucose-glucose bonds in cellulose cannot be broken down by human digestive enzymes, herbivores such as cows, buffalos, and horses are able to digest grass that is rich in cellulose and use it as a food source. In these animals, certain species of bacteria reside in the rumen (part of the digestive system of herbivores) and secrete the enzyme cellulase. The appendix also contains bacteria that break down cellulose, giving it an important role in the digestive systems of ruminants. Cellulases can break down cellulose into glucose monomers that can be used as an energy source by the animal.
