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Search results 1391 - 1400 of 1458 matching essays
- 1391: Fire Ants
- ... with forces that keep the food chain functioning. The fire ant and the African killer bee do not have natural enemies in the Southern United States that reside in South Africa. As mankind destroys the rain forests of South America for cattle grazing, he has released things like the Hunta virus, and the Ebola virus in Africa. Both of these viruses could rapidly destroy populations. Mankind has made tremendous leaps in ...
- 1392: Extinction of Dinosaurs
- ... would have also caused global wildfires. Scientists have discovered large quantities of sulfur around the crater at the Yucatan Peninsula. When the asteroid or comet hit, it would have mixed with water to form sulfuric acid, which would have created a barrier to block out light and heat from the sun. This could have lasted for decades. This cloud of darkness would have killed off vegetation, and then herbivores, having nothing ...
- 1393: DNA
- ... do human mean by "genetic technology" and how is it possible 3) How have human used this technology 4) Are humans concerned about this technology 1)The chemical basis of the plant earth is deoxyribonucleic acid (generally shortened to DNA), it has the shape of a long twisted ladder each rung of this ladder is made up of a pair of chemical bases, the information that human body need to make ...
- 1394: Diverrsity of Plants
- ... in which plant hormones are produced are not specialized particularly for that purpose, nor are there usually clearly defined receptor tissues or organs. The major classes of plant hormones--auxins, cytokinins, gibberellins, ethylene, and abscisic acid--interact in complex ways to produce a mature, growing plant. Unlike the highly specific hormones of animals, plant hormones are not produced in definite organs nor do they have definite target areas. They stimulate or ...
- 1395: Detection of Biological Molecules
- ... group is present in amino acids, and a carboxyl group can always be found in fatty acids. The groups can be separated into two more categories, the polar, hydrophilic, and the nonpolar, hydrophobic. A fatty acid is nonpolar, hence it doesn't mix with water. Molecules of a certain class have similar chemical properties because they have the same functional groups. A chemical test that is sensitive to these groups can ...
- 1396: History of the Cell Theory
- ... 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 ...
- 1397: Carnivorous Plants
- ... evolution of carnivorous plants is speculative due to the paucity of the fossil record. It is believed that plant carnivory may have evolved millions of years ago from plants whose leaves formed depressions that retained rain water. Small insects would sometimes fall into these water reservoirs and drown, eventually being decomposed by bacteria in the water. The nutrients from the insects would be absorbed by the leaf. The deeper the leaf ...
- 1398: Biotechnology
- ... society where we need not worry about a plague affecting our fruits and vegetation, nor our dairy and meat products. When we do not need to worry about certain factors like a draught or massive rain, we have a sociable balance between us and nature. Scientists have used biotechnology to an advantage here, and it seems applaudable. Yet, disadvantages may include harmful new substances in the plants being compounded together that ...
- 1399: The Effects of Antibiotics on Bacterial Growth
- ... either preserve the blue color of the original dye or they will obtain a red hue. The blue colored bacteria are gram-positive; the red bacteria are identified as gram-negative. Bacteria contain DNA (deoxyribonucleic acid) just like all cells. However, in bacteria the DNA is arranged in a circular fashion rather than in strands. Bacteria also contain ribosomes which, like in eukaryotic cells, provide for protein synthesis. In order for ...
- 1400: All About Ants (almost)
- ... one or two movable segments with humps on top and connect the gaster to the thorax. An ants gaster contains a crop and intestine. Some varities may also contain a poison gland, filled with formic acid that can be sprayed at a moments notice. This substance has proven very useful to people as it may be used as an insecticide, antibiotic, preservative, and disinfectant. Ants were originally the sole industrial source ...
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