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Drug Addiction Addictive Drugs
4,264 wordsThe emphasis is on biological mechanisms underlying addiction, although some other factors influencing drug addiction will also be discussed. The presentation is limited primarily to psychomotor stimulants (e. g. , amphetamine, cocaine) and opiates (e. g. , heroin, morphine) for two reasons. First, considerable knowledge has been gained during the past 15 years regarding the neurobiological mechanisms mediating their addictive properties. Second, these two pharmacological classes represent the b...
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Umbrella Cap Cell Dna Genetic Information Nucleus
616 wordsA. Experiment 1: Developing a Hypothesis Interpret the Results 1. The cytoplasm in the cut off foot got the information it needed to rebuild an entire Acetabularia cell from the nucleus. The nucleus contains all of the DNA (genetic information) and can therefore control all other functions of the cell. It has ability to control growth and reproduction of a new cell based on the information stored in the nucleus. The cell will not change because the information in the nucleus is still there to re...
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White Blood Cells Endoplasmic Reticulum
1,733 wordsThe studies of Robert Hooke 1665 into a plant material would allow the determination of a pore like regular structure surrounded by a wall of which he called cells this in itself unbeknownst to him, was the discovery of the fundamental unit of all living things. In 1838 a botanist called Schleiden derived the theory The basic unit of structure and function of all living organisms is the cell. Over 150 years later this can be regarded as one of the most familiar and important facts within the bio...
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Sir Isaac Newton Houghton Mifflin
1,786 wordsIncreasing our knowledge of Physics, using the scientific method to make observations and test hypotheses is essential to unlocking the secrets of the universe. Energy is one of the most fundamental elements of the universe. Throughout history, man has endeavored to expose, understand, and explain how and why things work. This drive to expand our understanding eventually led to the development of the scientific method and what is commonly considered to be the king of the sciences, Physics. The e...
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Type Of Cloning Desirable Traits
1,048 wordsGenetic engineering is the changing of an organism's DNA, genetic material to eliminate unwanted traits or to produce desirable traits. The earliest form of genetic engineering dates back to the scientist Gregor Mendel who did experiments with peas. He bred only the peas with the most desirable traits in order to achieve a healthier and stronger pea (McCuen 8). This method, called selective breeding, is still used today with plants and animals in order to increase food production. Corn plants ar...
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Closer We Are To Understanding Cell Nucleus The Cell Nucleus Human
285 wordsThe Discovery of the Cell Nucleus The cell nucleus was discovered in 1828. At this time no one really understood what it did but eventually it was found to be the control center for the cell and it organelles. The cell was discovered by a Robert Brown, a botanist. Robert Brown invented his own microscope with a crude system of lenses. He used the microscope to observe the nucleus of a plant cell and many other things. It was discovered when he was trying to find out how plants reproduce. Recent ...
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Cloning Of Human Beings Cloning Of Humans
2,643 wordsCloning, the process of? Manipulating a cell from an animal so that it grows into an exact duplicate of that animal is the forbidden fruit of biology. ? (Begley 54). The word? clone? , derived from the Greek word? Know? , meaning twig or slip, refers to asexual reproduction. Also known as vegetative reproduction. Cloning became known to the public about 30 years ago. This idea of cloning about his time resulted in an experiment of the successful asexual reproduction. This experiment took place i...
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Endoplasmic Reticulum Electron Microscope
1,979 wordsExplain With Aid Of A Diagram The Explain With Aid Of A Diagram The Working Of The Electron Microscope The diagram below shows a picture of an electron microscope. This is a type of microscope that makes use of a beam of electrons rather than visible light. Because the wavelength of electrons is much smaller than the wavelength of visible light, an electron microscope not only gives a high magnification but it also has high resolution. This means that details can be seen clearly. An electron mic...
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