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Free research papers and essays on topics related to: molecule
- Biology Molecule - 1,080 words
Biology Molecule Unit 1 -man is high 50s to 60% water -distribution in body divided into 3 compartments: 1) intracellular - 28 litres 2) intercellular/interstitial fluid - 11 litres - 80% 3) blood plasma - 3 litres - 20% -women contain less water than men -organisms can contain 60-80% water -bacteria have lots of water -fat cells have little -waters properties result from its structure and molecular interactions -water is polar -polar covalent bonds and asymmetrical shape give it opposite charges on opposite sides -electrons spend more time around O giving H a slight positive charge -hydrogen bonds form between the oxygen of one molecule and the hydrogen of another -cohesion: substance being ...
Related: biology, molecule, nucleic acids, human body, atom - Biology Molecule - 1,108 words
... covalent bond or a glycosiolic link -bond is angular and forms a spiral called an alpha helix -if it branches, amylopectin is formed -cellulose is a 1-4 linkage of beta glucose -this creates a straight strand and not a helix -these bonds are rigid and require special enzymes (cellulase) to break them -the position of the beta glucose molecules alternates Lipids: -humans rarely eat pure lipids -cell membranes are primarily lipid and lipids can easily enter cells, carrying a foods flavor with them -a diet should have less than 30% fat, 55-65% carbs, and 10-15% protein -lipids are important as a source of energy, insulation (adipose tissue), cushions for the internal organs, as a lubricant, ...
Related: biology, molecule, heart disease, boiling point, blood - The Importance Of Water To Life On Earth A Look At The Unique Structure And Behavior Of The Water Molecule By Steven Luscher, - 962 words
The Importance of Water to Life on Earth a look at the unique structure and behavior of the water molecule by Steven Luscher, Student Water is the most important substance in our evolution and our daily lives. Without water, life as we know it would not have been possible. This essay will examine the water molecule in order to ascertain how it brought about Earth's thriving ecosystem and how important it is to us today. ============================== ============================== Each water molecule consists of one oxygen atom and two hydrogen atoms. The oxygen atom (or the apex of the water molecule) bears a slight electronegative charge while hydrogen possesses a more positive one1 (fig ...
Related: bodies of water, molecule, planet earth, steven, kinetic energy - The Molecule - 932 words
The Molecule In the autumn of 1951, James Watson (left) and Francis Crick (right) started work on unravelling the structure of DNA. It was known at the time that DNA was present in the nucleus of every living cell, and that it had something to do with heridity, but without a knowledge of its structure little more could be understood about how it actually worked. They approached the problem with the same methodology that had been pioneered by Linus Pauling, who after years of exhaustive study had earlier discovered that many proteins exhibited a helical structure. Their task was to devise a structure which would account for all the chemical and X-ray evidence, and at the same time be consiste ...
Related: molecule, francis crick, deoxyribonucleic acid, linus pauling, wilkins - Downs Syndrome, Turners Syndrome, And Redgreen Color Blindness - 682 words
1.) Three genetic disorders are Down's syndrome, Turner's syndrome, and Red-green color blindness. They are all caused by undesirable genes inherited by normal genetic mechanisms. These mutations are usually recessive because dominant ones usually die. Turner's Syndrome is caused by faulty cell division known as non disjunction. This occurs when chromosomes fail to separate. IN this disorder, the affected have one "x" chromosome. The effect are an underdeveloped female, mental retardedness, and sterility. Down syndrome is a condition caused by an oddosome that occurs on the pair #21. It results in severe abnormality physical and mental defects. For example, shorter bubble-shape eyes, short f ...
Related: blindness, down syndrome, downs, cell division, external environment - Acid Precipitation - 663 words
Acid Precipitation Acid Precipitation Our atmosphere functions as living ecosystem of chemical reactions. Through the help of the water cycle, chemicals pass through the atmosphere and are eventually taken up by the soil, surface water, or organic materials. Human beings have added enormously to the atmospheric burden of many toxic substances. The most prominent evidence of this is the presence of acid rain: precipitation and particles that have been made acidic by air pollution. Acid rain is a direct consequence of the atmosphere's self-cleansing process. The tiny droplets of water that make up clouds continuously capture suspended particles and soluble trace gases. Not all trace gases can ...
Related: acid, acid rain, precipitation, air pollution, power plants - Active Transport - 1,302 words
Active Transport Since the cell membrane is somewhat permeable to sodium ions, simple diffusion would result in a net movement of sodium ions into the cell, until the concentrations on the two sides of the membrane became equal. Sodium actually does diffuse into the cell rather freely, but as fast as it does so, the cell actively pumps it out again, against the concentration difference. The mechanism by which the cell pumps the sodium ions out is called active transport. Active transport requires the expenditure of energy for the work done by the cell in moving molecules against a concentration gradient. Active transport enables a cell to maintain a lower concentration of sodium inside the c ...
Related: transport, early stages, carbon dioxide, carried away, chloroplasts - Aging Theories - 1,709 words
Aging Theories This report outlines the main theories of how the process of aging works. Since researchers have not discovered a universally-accepted theory of aging, the theories discussed are potential explanations of how we age. The likelihood of each hypothesis is considered roughly equal. The different theories discussed focus on the workings of different parts of the body, from the molecular level of DNA mutations and replication, to the organism level of becoming "worn out." Aging is a very complex and gradual process, and its ongoing operation is present to some degree in all individuals. It is a journey to the maturity, as well as to the degeneration of the body. Because aging affec ...
Related: aging, aging process, cell division, free radicals, gradual - Aids - 1,140 words
... f the mouth by the fungus Candida Albicans, is common in the early symptomatic phase of AIDS. Other infectious fungi include species of the genus Cryptococcus, a major cause of Meningitis in up to 13 percent of people with AIDS. Also, infection by the fungus Histoplasma Capsulatum affects up to 10 percent of people with AIDS, causing general weight loss, fever, and respiratory complications or severe central nervous system complications if the infection reaches the brain. Viral opportunistic infections, especially with members of the Herpes virus family, are common in people with AIDS. One Herpes family member, Cytomegalovirus (CMV), infects the retina of the eye and can result in blindn ...
Related: aids, blood cells, nervous system, human cells, nose - Aids - 1,140 words
... rom a few days to several weeks and is associated with fever, sweats, exhaustion, loss of appetite, nausea, headaches, soar throat, diarrhea, swollen glands, and a rash on the torso. Some of the symptoms of the acute illness may result from HIV-1 invasion of the central nervous system. In some cases the clinical findings have correlated with the presence of HIV-1 in the cerebrospinal fluid. Symptoms disappear along with the rash and other sings of acute viral disease. When the blood test for HIV-1 antibodies become available, researchers demonstrated the lymphadenopathy was a frequent consequence of infection with the virus. Scientist do not know what causes the wasting syndrome, but som ...
Related: aids, immune system, human immunodeficiency, recent studies, regulation - Aids Whats New Is The Message Getting Through We Already Know Enough About Aids To Prevent Its Spread, But Ignorance, Complac - 1,708 words
AIDS - What's new ? ------------------- Is the message getting through? We already know enough about AIDS to prevent its spread, but ignorance, complacency, fear and bigotry continue to stop many from taking adequate precautions. We know enough about how the infection is transmitted to protect ourselves from it without resorting to such extremes as mandatory testing, enforced quarantine or total celibacy. But too few people are heeding the AIDS message. Perhaps many simply don't like or want to believe what they hear, preferring to think that AIDS "can't happen to them." Experts repeatedly remind us that infective agents do not discriminate, but can infect any and everyone. Like other commun ...
Related: aids, whats, human cells, blood cells, usual - Air Pollution - 1,546 words
Air Pollution Air Pollution is addition of harmful substances to the atmosphere resulting in damage to the environment, human health, and quality of life. One of many forms of pollution, air pollution occurs inside homes, schools, and offices; in cities; across continents; and even globally. Air pollution makes people sick, it causes breathing problems and promotes cancer, and it harms plants, animals, and the ecosystems in which they live. Some air pollutants return to earth in the form of acid rain and snow, which corrode statues and buildings, damage crops and forests, and make lakes and streams unsuitable for fish and other plant and animal life. Pollution is changing the earth's atmosph ...
Related: air pollution, pollution, greenhouse gases, global scale, burn - Amylase - 309 words
Amylase The enzyme amylase will catalyze the hydrolysis of starch to maltose when the pH is near 7.0. But when the HCl is added to the solution the amylase will be denatured which results in the enzyme being deactivated. The iodine serves as an indicator for the presence of starch. Iodine (I2) will reach with iodide ion to produce the I3- ion. This ion will form a dark blue complex with the starch molecule. Like most chemical reactions, the rate of an enzyme-catalyzed reaction increases as the temperature is raised. A ten degree Centigrade rise in temperature will increase the activity of most enzymes by 50 to 100%. Variations in reaction temperature as small as 1 or 2 degrees may introduce ...
Related: frozen, adversely, indicator - Anesthetics - 1,467 words
... amount of side effects. Throughout the country there are many different types of anesthetics used. Some of the most popular anesthetics are used in U.S. hospitals across the region. Among general anesthetics, cyclopropane, ethylene, and halothane are the most popular. Cyclopropane and ethylene are used with caution because they are highly explosive. Halothane is the most prefered over the three because it is neither inflammable or explosive. Amongst intravenous anesthesia, Pentothal sodium is the most popular. This is because it produces the least amount of side effects during and after a surgical procedure. Block anesthesia is the most common and popular of the group known as local anes ...
Related: different types, new england, side effects, concentration, 1984 - Anthropolgy - 1,276 words
Anthropolgy Anthropology- the study of humankind everywhere, through time, seeks to produce reliable knowledge about people and their behavior, both about what makes them different and what they have in common. What They Do- Physical anth- study humans as biological organisms, tracing there evolutionary development of the human animal and looking at biological variations within the species, past and present (human evol, Primates, Human diversity. Cultural Anth- is concerned with human cultures, or the ways of life in societies. Culture bound- Theories about the world and reality based on the assumptions and values of ones own culture. Within the field of cultural anth are Archaeologist- Is t ...
Related: blue eyes, common culture, human diversity, assign, volcanic - Antibiotics - 560 words
Antibiotics Antibiotics are chemical compounds used to kill or inhibit the growth of infectious organisms. Originally the term antibiotic referred only to organic compounds, produced by bacteria or molds, that are toxic to other microorganisms. The term is now used loosely to include synthetic and semisynthetic organic compounds. Antibiotic refers generally to antibacterials; however, because the term is loosely defined, it is preferable to specify compounds as being antimalarials, antivirals, or antiprotozoals. All antibiotics share the property of selective toxicity: They are more toxic to an invading organism than they are to an animal or human host. Penicillin is the most well-known anti ...
Related: bacterial cell, amino acids, nucleic acids, classified, chromosome - Antisense Theory - 586 words
Antisense Theory It is estimated that cancer affects three out of four families in the United States alone the disease and its treatments cause substantial mortality and morbidity, prompting intense interest in cancer prevention. Most available treatments for cancers are non-specific; meaning that they target all rapidly growing cells, both normal and cancerous. Consequences of these treatments include side effects towards the normal cells. In addition, cancer is a genetically unstable disease. Cancer cells can develop drug resistance through repeated rounds of mutation and selection. This may render a particular non-specific chemotherapeutic treatment ineffective so that new drugs must be a ...
Related: human genome, side effects, gene expression, render, bound - Bio Outline - 2,398 words
Bio Outline BIOLOGY 220 OUTLINE SECTION II Text: Essential Cell Biology I. Opening Comments (Chapter 3) A. Life creates order out of disorder through a never-ending series of chemical reactions B. This is Metabolism and the ability to Metabolize C. Most of the chemical reactions required by the cell would not occur at physiological conditions D. Control of these reactions is achieved by specialized protein, ENZYMES. II. Basic Principles of Energy A. Energy - Basics Principles 1. Define Energy - ability to do work 2. Define Work - the ability to change the way matter is arranged 3. Define Kinetic Energy 4. Define Potential energy - energy of position 5. FIRST LAW of THERMODYNAMICS Energy can ...
Related: outline, energy level, carbon dioxide, basic principles, storage - Bio Outline - 2,483 words
... lecule of glucose requires (1) 18 ATP 7.3 kcal/mole x 18 = 131.4 kcal (2) 12 NADPH 53 kcal/mole x 12 = 636 kcal (a) Note 53 kcal/mole - ref: Campbell pg. 178 for NADH to O2 H2 O (3) Takes 767.4 kcal to make 1 molecule of glucose (686 kcal) (a) 686/767.4 = 89% efficiency. F. PHOTORESPIRATION (Use Study Sheet) 1. Rubisco prefers O2 to CO2 2. If rubisco binds O2 a. Process uses 6 additional ATP b. Regenerates RuBP c. Produces a 2-C compound (instead of 3-C) d. This compound is sent to peroxisome and mitochondrion (1) converted to Glycerate (3C) (2) transported back to chloroplast (3) Uses ATP to convert to 3-PGAL 3. NET LOSS OF ENERGY 4. Some plants waste as much as 50% of the energy they ...
Related: outline, compare and contrast, citric acid cycle, krebs cycle, acid - Biological Viruses: All Time Enemies - 1,170 words
Biological Viruses: All Time Enemies First came fever. Then Hamid Mansaray, a young nurse's aide at a remote African hospital, began to hemorrhage. Blood erupted from his nose and mouth. It burst out of capillaries beneath his skin and eyes. By the time I reached the village of Panguma in Serria Leone, Mansaray lay isolated in a special ward. Doctors had diagnosed an obscure illness called Lassa fever. Its cause was a virus, an infective agent so small that 100,000 of them clumped together would still scarcely be visible. Viruses are little more than bundles of genes - strands of DNA or RNA, the molecules that carry the blueprints for all life. Yet viruses are far from simple. They invade ar ...
Related: biological, white blood cells, yellow fever, common cold, contracts
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