.... a network called chromatin. In addition to genes, chromosomes contain proteins, some of which cover the genes that are not "turned on" at the particular time. The original genetic information, stored in a coded form DNA, is carried out of the nucleus by RNA and then translated into proteins by ribosomes. 70% of oncogenes are located in the weak points of the chromosomes-hereditary regions where the DNA molecule may break or its portions may be rearranged into new combinations. Actually most of the times, the nucleus and the DNA are constantly exposed to substances that may alter the genes. But these alterations are almost always prepared by intricat .....

.... will happen. I will end my speech by reinforcing one of the purposed solutions. As I have stated before in 1992 there was a changing event when four species of salmon were placed on the Endangered Species List. According to a Protecting the Environment ’99 article “A look at the impacts of removing dams� by Chris Fowler, it states, “The listing triggered a series of events which have led the Army Corps of Engineers to consider the removal of four dams on the Lower Snake River.� There is no disputing the fact that the number of native salmon swimming in the rivers and streams of the Pacific Northwest are dangerously low levels. Most experts b .....

.... can be closely estimated and the consequences of their activities can be measured. For example, the volume of carbon dioxide, methane and nitrous oxide emissions is an indicator of human's energy and resource consumption. An examination of population size, atmospheric concentrations of these gases and global temperature relative to time and with respect to each other is presented here to demonstrate the relations among these factors. POPULATION GROWTH Many of us have seen linear graphs of human population showing the enormous growth in the last two centuries. However, significant changes in population dynamics are lost in the exponential gr .....

.... brake through. With the use of gene technology it is possible to create a ‘perfect’ organism. Useful characteristics can be transferred from one species to another, this includes animals with plants and vice a versa. As a result it is possible to make foods with high resistance to whether, temperature, pesticides, etc. therefore crop quality and amount grown would increase. Another area of genetic technology involves inserting genes into plants to make them immune to common viruses, this could increase the crop production. If the crop production could be increased, food would become cheaper and easier to obtain. For economical reasons gene .....

.... are not exclusive because most clastic carry some chemical sediment, and most chemical also contain some loose sediment material. All are in general characterized by the parallel arrangement of their mineral layers or beds, which are distinguished from each other by differences in thickness, the size of the grains, or color. All rock disintegrate slowly as a result of mechanical weathering and chemical weathering. Mechanical weathering is the breakdown of rock into particles without producing changes in the chemical composition of the minerals in the rock. Ice is the most important agent of mechanical weathering. Water percolates into cracks and .....

.... decreased the adverse side effects of the drugs greatly. Currently the birth control pill has the highest efficacy rate, with a 99.9% effectiveness rate for combination regimens and a 99.5% effectiveness rate for progestin only regimens in clinical trials. It is extremely important to take the pills on a regular basis and at a regular time of day (say after dinner or with breakfast every day) as effectiveness drops with improper usage. The birth control pill cannot be used as a "morning after pill" without the advice and monitoring of a physician. Common side effects of birth control pills are nausea; vomiting; cramps; bloating; breakthrough .....

.... A description of the classification, mechanism of infection, transmission, distribution, and treatment of the disease will be provided. After reviewing the background material, a great deal of questions may arise as to how exactly this disease is spread from person to person and what conditions promote infection. For example, one may wish to investigate the following: 1) Mycobacterium leprae as yet to be cultured in laboratory media? Why? 2) Why is leprosy so prevalent in some parts of the world (i.e. India) but not in others? 3) How does leprosy become so widespread in a population? 4) Despite the discovery of drug treatments, why are over mil .....

.... anaphase, and telophase. In prophase, the nucleoli disappears and the chromatin fibers become discrete chromosomes. The mitotic spindle also beings to form and the centrioles begin to move towards opposite ends of the cell. Also occurring later in prophase, the nuclear envelope fragments, and the microtubles attach to the kinetochores and overlap. In Metaphase, the chromosomes line up along the metaphase plate. The centromeres are all aligned and the sister chromatids straddle the metaphase plate. Anaphase beings when the sister chromatids are pulled away from each other. The chromosomess begin moving along the microtubles towards opposite end .....

.... angiosperms, guide the activities of insects and other pollinators so that pollen is dispersed rapidly and precisely from one flower to another of The same species, thus promoting out crossing. Many angiosperms display other modes of pollination, including self-pollination. Evolutionary Origins Plants derived from an aquatic ancestor, but the evolution of their conducting tissues, cuticle, stomata, and seeds has made them progressively less dependent on water. The oldest plant fossils date from the Silurian Period, some 430 million years ago. The common ancestor of plants was a green alga. The similarity of the members of these two groups c .....

.... does not have many uses. It is used in photocells because of the electrical conductivity of thallium sulphide. Thallium was originally used to help treat ringworm and many other skin infections. It was then limited because of the narrow margin between the benefits and its health risks. Thallium bromide-iodide crystals are still used as infrared detectors. Thallium sulphate used to be widely used as a pesticide and an ant killer. It was odorless and tasteless and worked well, but it was found to be too toxic. Thallium slats which burn with a bright green flame are used in flares and rockets. Thallium is the 60th most abundant element in the E .....