what is an antioxidant???
353146
It is an enzyme that can counteract the damagging effects of oxygen in tissues. Like the vitamin E.
940592
Oxidizing agents.  What immediately comes to mind, is H2O2, which is an oxidizer, and is a common antiseptic.
259444
BHA & BHT (butylated hydroxy anisole & butylated hydroxy tolulene) are perfectly safe. They are anti-oxidants that help preserve food longer & prevent the lipids in food from oxidizing into harmful free-radicals. They're present in foods in such small quantities that your body can't really even recognize them
366777
It's not much, but try these two sites:\n\nhttp://en.wikipedia.org/wiki/Antioxidants\n\nhttp://en.wikipedia.org/wiki/Sulfur-reducing_bacteria
249790
apart from joke, it is a molecule that has a lone, not paired electron, and therefore highly reactive, eager to combine with  about every other molecule. in the human body you are protected from free radicals by anti-oxidants, so eat healthfully.
324771
Antioxidants combat or prevent oxidative stress in the body. One of the by products of your body using oxygen for fuel is that it produces oxidants, these are also known as free radicals, free radicals can also be "other" substances that are harmful to the body like environmental toxins etc. Antioxidants destroy these thing and help to keep your immune system functioning well. Antioxidants are found in plentiful supplies in most fresh fruits and vegetables. Some in red wine, teas and other herbs. They are a good thing to have plenty of. Some antioxidants prevent DNA damage and are instrumental in fighting such diseases as cancer and more.\n\nHope this helps.\n\nCraig - Naturopath.
593464
Vitamin C\n"granduation"
765542
A) an oxidation reaction\n\nthat's why they are called redox
968238
d) Reducing agent. Oxidation is the loss of electrons. The substance getting oxidized donates the electrons to the subnstance getting reduced. For that reason, a) Electron donor is also correct.\n\nI don't know if you're allowed more than one answer to this question. It may be that the teacher did not see that the reducing agent was an electron donor, and thought of electron donation in the Lewis base sense, which does not come up in this question.
710796
An oxidation reaction.\n\nAn oxidation reaction is associated with the loss of electrons.  The lost electrons have to go somewhere and thus a reduction reaction, which is associated with the gaining of electrons, occurs accompanies it.
896552
I would say d because they are antioxidants.  see article below for more info:\nhttp://chemistry.about.com/library/weekly/aa082101a.htm
763062
Eat more food that contain antioxidants that will destroy the free-radicals. Eat a healthy diet that reduces foods that produce cholesterol
262227
any oxidative substance (potassium permanganate), ultraviolet rays, sun, air, hydrogen peroxide, etc
36087
Oxidizers are chemicals that have highly electronegative atoms (things like O, F, and Cl) that will try to take electrons away from atoms with less electronegativity.  O2 is the classic example.  An oxidizer will react with a reducer to form a redox reaction (aka an Oxidation/reduction reaction).  With powerful oxidizers, important things like DNA can act as a reducer.  The result is that oxidizers can damage DNA.  Antioxidants act as free reducers (ie they have an excess of electrons and little electronegativity) in the bloodstream that dangerous oxidizers will react with, hence lowering the risk for our DNA and such.
117833
ANTIOXIDANTS \n\nThese are used to prevent rancidity in fatty foods and to protect the fat-soluble vitamins (A, D, E, and K) against damage by oxidation. Synthetic antioxidants include esters of gallic acid, butylated hydroxytoluene, and butylated hydroxyanisole. Vitamins C and E are also commonly used as antioxidants; they obviously enhance the nutritional value of the food to which they are added; indeed, there is some evidence that synthetic antioxidants used in food manufacture also have useful antioxidant action in the body.\n\n\n\n\nFREE RADICALS, any molecule capable of independent existence that contains one or more unpaired electrons. An unpaired electron is one that occupies an atomic or molecular orbital by itself. A free radical can be regarded as a fragment of a molecule; free radicals are often extremely reactive, and therefore short-lived.\n\nOrganic free radicals were recognized by Gomberg in 1900 and this led to speculation that free radical species might play a role in biology. In 1966 Slater proposed that a free radical reaction was the cause of carbon tetrachloride's toxic effect on liver cells, and the theory that free radicals play a role in tissue damage was born.\n\nFree radicals are produced in most cells of the body as a byproduct of metabolism, although some cell types manufacture larger quantities for specific purposes (for example, by macrophages during phagocytosis. see Immune System). The most important free radicals found in aerobic cells, such as those in humans, are oxygen, superoxide, hydroxyl radical, hydrogen peroxide, and the transition metals. When free radicals form within cells they can oxidize biomolecules (molecules used inside cells, especially lipids) and thus cause cell death and injury. However, the human body has developed various mechanisms in order to protect itself from the damaging effects of free radicals. There are enzymes which decompose peroxides and transition metals; other free radicals are sequestered by proteins and other molecules.\n\nFree radicals are difficult to study because they are only present for very short periods. They usually react with other molecules very quickly. In recent years, it has become accepted that they play an important part in several medical conditions. DNA (see Nucleic Acids) is particularly susceptible to oxidation by free radicals and it has been suggested that these substances may have a role to play in the mutations which precede the development of cancer. This may explain why some transition metals, such as nickel and chromium, are carcinogenic under certain circumstances. Free radicals have also been implicated in atherosclerosis, liver damage, lung disease, kidney damage, diabetes mellitus, and ageing. It is not always easy to tell if free radicals are the cause of a disorder or a result of some other causative agent.\n\n\n\nVirus (biology)\nI  INTRODUCTION \n\nVirus (biology) (Latin, “poison”), any of a number of organic entities consisting simply of genetic material surrounded by a protective coat. The term “virus” was first used in the 1890s to describe agents that caused diseases but were smaller than bacteria. By itself a virus is a lifeless form, but within living cells it can replicate many times and harm its host in the process. The hundreds of known viruses cause a wide range of diseases in humans, other animals, insects, bacteria, and plants (see Diseases of Animals).\n\nThe existence of viruses was established in 1892, when Russian scientist Dmitry I. Ivanovsky discovered microscopic particles later known as the tobacco mosaic virus. The name virus was applied to these infectious particles in 1898 by the Dutch botanist Martinus W. Beijerinck. A few years later, viruses were found growing in bacteria; these viruses were dubbed bacteriophages. Then, in 1935, the American biochemist Wendell Meredith Stanley crystallized tobacco mosaic virus and showed that it is composed only of the genetic material called ribonuc
137802
Oxidants (oxidative stress) can cause lipid peroxidation.  Oxidative stress is a natural byproduct of the use of oxygen by biological systems.  It is also caused by various biological processes such as inflammation, immune reactions, and detoxification processes.  Unsaturated fattys acids (especially in cell membranes) are very susceptible to damage by oxidative stress.  This damage results in lipid peroxidation (literally - 'fat oxidation').  Antioxidants (especially vitamin E) work to prevent excessive levels of oxidative stress in cell membranes and therefore, help prevent lipid peroxidation. Lipid peroxides can lead to damage to DNA.  DNA damage can contribute to the risk of developing various cancers.
268306
Vitamin C is essential for healthy teeth, gums and bones. It helps heal wounds and scar tissue, Fractures; prevents scurvy; builds resistance to infection; aids in the prevention treatment of the common cold; gives strength to blood vessels; aids in the absorption of iron. It is required for the synthesis of collagen, the intercellular cement which holds tissues together. It is also one of the major antioxidant nutrients.\nFor more information about treatment and products go at: