Totipotent cells formed during sexual and asexual reproduction include spores and zygotes. Zygotes are the products of the fusion of two gametes. In some organisms‚ cells can dedifferentiate and regain totipotency. For example‚ a plant cutting or callus can be used to grow an entire plant. Human development begins when a sperm fertilizes an egg and creates a single totipotent cell called zygote. In the first hours after fertilization‚ this cell divides into identical totipotent cells. Approximately four days
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Essay 1: Light and Color The fascinating properties of light are not all detectable to humans‚ because our reference is mostly limited to what we can see. In order to determine the atomic/molecular composition of a fluid or gas‚ one must consult an emission and absorption spectrum. The properties of this spectrum include also waves‚ which can be any length‚ and define the spectrum of electromagnetic radiation. Ranging from gamma rays to radio waves‚ an electromagnetic spectrum includes each
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A world without plants Plants; probably the most ignored organism on this planet. People walk past plant and cut them down but nobody ever thinks about what they do for us‚ what the world would be if there was never any plants or photosynthetic organisms. If the world never had these organisms the world would be a desolate place. There would be no oxygen‚ atmosphere‚ or food. We inhale air unconsciously every day. By taking in air‚ we absorb oxygen and discharge carbon dioxide in the process of
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Artificial Nails - Acrylic‚ Gel and Silk - What’s the Difference? Whether you want your nails to look beautiful because your class reunion is coming up‚ your best friend is getting married or you are heading out of town to meet a long-lost relative‚ professional nail technicians have the tools‚ experience and skills necessary to give you the gorgeous‚ natural-looking nails you desire. Choosing an Artificial Nail Material For the most part‚ nail technicians use acrylic‚ gel and silk to create artificial
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Stand on a street corner and ask people if they know what insulin is‚ and many will reply‚ "Doesn’t it have something to do with blood sugar?" Indeed‚ that is correct‚ but such a response is a bit like saying "Mozart? Wasn’t he some kind of a musician?" Insulin is a key player in the control of intermediary metabolism. It has profound effects on both carbohydrate and lipid metabolism‚ and significant influences on protein and mineral metabolism. Consequently‚ derangements in insulin signaling have
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The Light Bulb: One of the Most Useful Inventions in the World People need light to be able to see. In the morning‚ there is sunlight. But in the night‚ people use electric light made from light bulbs. Without light bulbs‚ people would not be able to see and would have to rely on their other senses to do tasks. Without light bulbs‚ our lives would be very different. The light bulb is a very useful invention that people all over the world use every day. The creation of the light bulb can be traced
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Light Pollution 1. Every urbanite knows the bright lights of the city make it impossible to see the stars in a night sky. What most of us do not know is that those lights also may be making us sick. The cause is light pollution – the unearthly glow of billions of street lamps‚ security and porch lights‚ searchlights‚ office lights and signs – as people everywhere try to dispel the darkness of the night. 2. For the first time‚ light is being investigated seriously as a pollutant and a health hazard
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The Coca plant is in the Kingdom Plantae‚ the Phylum Magnoliophyta‚ the Class Magnoliopsida‚ the order Mapighiales‚ the Family Erythroxylacae‚ the Genus Erythroxylum‚ and the Species Erythroxylum Coca. The Coca plant originates in Northwestern South America particularly Columbia‚ but it can also be found in Peru‚ Venezuela‚ and Bolivia. The Coca plant can grows to a height of 7–10 ft‚ the branches are straight‚ and the leaves are green tinted ovals. The plant also has small yellowish-white flowers
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When teachers asked that what it is you want to be when you grow up‚ most children do not respond with "a career in financial services". Like most children‚ I responded with reference to jobs that seemed fun at the time. My first choice was a typewriter and translator‚ second naturally a pianist‚ but the third and most important choice was a computer engineer because I like computer‚ typing‚ translating a work and playing piano. If I were a computer engineer‚ I will
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Wavelength on Raphanus Sativus Abstract: Light from the Sun is a full spectrum of different wavelengths of light. Scientists refer to this light as “white light”. When the wavelength of visible light changes‚ so does the color seen by the eye. The shortest wavelengths visible to the human eye are violet (400 nanometers). The longest wavelengths visible the human eye are red (700 nanometers). Each plant is affected differently by the changing wavelengths of light. The purpose of this experiment is to
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