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TERM PAPERS ON BIOLOGY
A Study of Inheritable Traits in Fruit Flies
The Drosophila melanogaster, more commonly known as the fruit fly, is a popular species used in genetic experiments. In fact, Thomas Hunt Morgan began using Drosophila in the early 1900’s to study genes and their relation to certain chromosomes (Biology 263). Scientists have located over 500 genes on the four chromosomes in the fly. There are many advantages in using Drosophila for these types of studies. Drosophila melanogaster can lay hundreds of eggs after just one mating, and have a generation time of two weeks at 21°C (Genetics: Drosophila Crosses 9). Another reason for using fruit flies is that they mature rather quickly and don’t require very much space. Drosophila melanogaster has a life cycle of four specific stages. The first stage is the egg, which is about .5mm long. In the 24 hours when the fly is in the egg stage, numerous cleavage nuclei form. Next, the egg hatches to reveal the larva. During this stage, growth and molting occur. Once growth is complete, the Drosophila enter the pupal stage, where it develops into an adult through metamorphosis. Upon reaching adulthood, the flies are ready to mate and produce the next generation of Drosophila melanogaster.
Read whole term paperAnimals in The Research Lab
The use of living animals is an important way to solve a medical problem. Researchers continually seek other models to understand the human organism, study disease processes, and test new therapies. In seeking quicker and not so expensive ways to look for biological information that can be applied to human disease, scientists sometimes study simpler things such as bacteria, fruit flies and a few other things. Researchers have spent many years learning how to sustain cells, tissues and organs from animals and humans outside the body to understand biological processes and develop new medical treatments. Computers allow scientists to analyze vast amounts of data and test new ideas. But, in the end, the results obtained must be verified in appropriate animal systems and, possibly as the final step, in clinical trials using humans who will volunteer.
Before beginning a project, all research proposals involving animals must be reviewed and approved by a committee comprised of scientists, veterinarians, and private citizens.
Animal activist organizations believe that there are no moral reasons for the use of animals in research. This has attempted to slow or halt the work of scientists. Some activists groups intimidate or harass individual scientists, conduct demonstrations, or sometimes commit acts of vandalism. There are a few health professionals who support the activist movement but they truly stand apart from the vast majority of physians and most Americans who readily accept the fact that animal research is necessary to gain medical progress.
Read whole term paperAntibiotic Resistance in Bacteria
For about 50 years, antibiotics have been the answer to many bacterial infections.
Antibiotics are chemical substances that are secreted by living things. Doctors prescribed these medicines to cure many diseases. During World War II, it treated one of the biggest killers during wartime - infected wounds. It was the beginning of the antibiotic era. But just when antibiotics were being mass produced, bacteria started to evolve and became resistant to these medicines.
Read whole term paperAustralopithecus
There are many types of the hominid called Australopithecus, which means southern apes. These were small ape-like creatures with a height between 107cm and 152cm) that showed evidence of walking upright. It is difficult to tell whether these begins are "humans" or "apes". Many of their characteristics are split between humans and apes.
Read whole term paperCancer
Right now, cancer is one of the most feared diseases in the world. In the early 1990s almost 6 million new cancer cases developed and more than 4 million deaths from cancers occurred. Also more than one-fifth of all deaths were caused by cancer and it has been predicted, by the American Cancer Society, that about 33% of Americans will eventually develop this disease. This is a huge disease that is killing people all over the world.
The field of cancer study is called Oncology. The government has spent billions of dollars on research of this fatal disease. Cancer is the most aggressive disease of a larger class known as neoplasms. Neoplasms do not fully comply with the parts of the cell that control the growth and functions of the cell. These cells eventually become abnormal growths and can be recognized as not normal tissue. These traits are passed down as the cell reproduces therefore spreading the cancer.
Read whole term paperThe Effects of Antibiotics on Bacterial Growth
Bacteria are the most common and ancient microorganisms on earth. Most bacteria are microscopic, measuring 1 micron in length. However, colonies of bacteria grown in a laboratory petri dish can be seen with the unaided eye.
Read whole term paperAcid Rain Essay
Within this past century, acidity of the air and acid rain have become recognized as one of the leading threats to our planet’s environment. No longer limited by geographic boundaries, acid causing emissions are causing problems all over the world. Some laws have been passed which limit the amount of pollutants that are released into the air, but tougher legislation must be implemented before this problem can be overcome.
Acid rain is produced, when automobiles, smelters, power plants, and other industrial factories burn fossil fuels such as gasoline, coal, and fuel oils. When combusted, the non renewable resources release pollutants such as sulfur, carbon and nitrogen oxides into the air. These oxide combine with the humidity in the air and form sulfuric, nitric and carbonic acid. This acidic solution eventually condenses in the air and comes back down to the earth in any from of precipitation (snow, rain, hail).
Read whole term paperHistory of the Cell Theory
Cells, the make-up of all living things. Some cell are complete organisms, such as unicellular bacteria and protozoa. Other types of cells are called multicellular, such as nerve cells and muscle cells. Withen the cell is genetic material, Deoxyribonucleic Acid (DNA) containing coded instructions for the behavior and reproduction of the cell. The cell was first discovered by the 1665 English scientist Robert Hooke, who studied the dead cells of cork with a crude microscope. Robert Hooke was born on the isle of Whight and educated at the University of Oxford. Hooke could not have discovered the cell without the microscope which was developed by Antoni van Leeuwenhoek a 1674 Dutch maker of microscopes. Leeuwenhoek born in Delft, Holland and had little or no scientific education. Leeuwenhoek also confirmed the discovery of capillary systems. Theodor Schwann a German physiologist born in Neuss and educated at the universities of Bonn, Wurzburg, and Berlin, Schwann was involved in the study of the structure of plant and animal tissues. Along with Matthias Jakob Schleiden a German botanist, Schwann proposed the cell theory.
Read whole term paperA Massive Project for the Benefit of Mankind
A Look at the Human Genome Project
Scientists are taking medical technology to new heights as they race to map all of the genes, nearly 100,000, in the 23 chromosomes of the human body. Along the way, they hope to understand the basis of, and maybe even develop methods of treating certain genetic diseases, such as Alzheimer’s and Muscular Dystrophy. They plan to do this by identifying the DNA sequence of an abnormal gene in which a disease originates and comparing it with the data of a normal or healthy gene. The entire research project is entitled "The Human Genome Project."
Read whole term paperCloning : Where Do We Draw the Line?
The first attempt in cloning was conducted in 1952 on a group of frogs. The experiment was a partial success. The frog cells were cloned into other living frogs however, only one in every thousand developed normally , all of which were sterile. The rest of the frogs that survived grew to abnormally large sizes. In 1993, scientist and director of the in vitro lab at George Washington University, Jerry Hall and associate Robert Stillman, reported the first ever successful cloning of human embryos. It was the discovery of in-vitro fertilization in the 1940’s that began the pursuit to ease the suffering of infertile couples. After years of research, scientists learned that "in a typical in-vitro procedure, doctors will insert three to five embryos in hopes that, at most, one or two will implant" (Elmer-Dewitt 38). And that "a woman with only one embryo has about a 10% to 20% chance of getting pregnant through in-vitro fertilization. If that embryo could be cloned and turned into three or four, the cha
nces of a successful pregnancy would increase significantly"(Elmer-Dewitt 38).
Read whole term paperAIDS + HIV
Being one of the most fatal viruses in the nation, AIDS (Acquired Immunodeficiency Syndrome) is now a serious public health concern in most major U.S. cities and in countries worldwide. Since 1986 there have been impressive advances in understanding of the AIDS virus, its mechanisms, and its routes of transmission. Even though researchers have put in countless hours, and millions of dollars it has not led to a drug that can cure infection with the virus or to a vaccine that can prevent it. With AIDS being the leading cause of death among adults, individuals are now taking more precautions with sexual intercourse, and medical facilities are screening blood more thoroughly. Even though HIV ( Human Immunodeficiency Virus) can be transmitted through sharing of non sterilize needles and syringes, sexual intercourse, blood transfusion, and through most bodily fluids,
it is not transmitted through casual contact or by biting or blood sucking insects.
Read whole term paperAlbinism
The word "albinism" refers to a group of inherited conditions. People with albinism
have little or no pigment in their eyes, skin, or hair. They have inherited genes that do not
make the usual amounts of a pigment called melanin. One person in 17,000 has some type of albinism. Albinism affects people from all races. Most children with albinism are born to parents who have normal hair and eye color for their ethnic backgrounds. Albinism is found on the eleventh chromosome, section q, loci 14-21.
Read whole term paperAll About Ants
Among the many hundreds of thousands of astonishing organisms with which we must share this earth, there is one seemingly ordinary group of specimens which fascinates many people beyond all others. There is nothing too extraordinary in the proportions or appearance of ants, but it is their history and culture that induces a second look. These insects are about as different from us mammals as two organisms can be, yet it appears that of all the known animals their way of life appears closest to our human way of life. The similarities in the ways in which we organize our lives are astounding. Ants are doubtlessly the most successful of all the social insects of the Hymenoptera, an order also including wasps and bees.
Read whole term paperAlzheimer's Disease
Alzheimer's Disease is a progressive and irreversible brain disease that destroys mental and physical functioning in human beings, and invariably leads to death. It is the fourth leading cause of adult death in the United States. Alzheimer's creates emotional and financial catastrophe for many American families every year, but fortunately, a large amount of progress is being made to combat Alzheimer's disease every year. To fully be able to comprehend and combat Alzheimer's disease, one must know what it does to the brain, the part of the human body it most greatly affects. Many Alzheimer's disease sufferers had their brains examined. A large number of differences were present when comparing the normal brain to the Alzheimer's brain. There was a loss of nerve cells from the Cerebral Cortex in the Alzheimer's victim. Approximately ten percent of the neurons in this region were lost. But a ten percent loss is relatively minor, and cannot account for the severe impairment suffered by Alzheimer's victims. Neurofibrillary Tangles are also found in the brains of Alzheimer's victims.
Read whole term paperAmyotrophic Lateral Sclerosis (Lou Gherig's Disease)
Amyotrophic Lateral Sclerosis is a deadly disease of the nervous system. Also known as Lou Gehrig’s disease, ALS at this time affects 25,000 people in the U.S. today. One in 50,000 people will be affected in any one year. The average age for diagnosis of ALS is between 30 and 70, although there have been cases of teenagers contracting it.
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