non-technical introduction to the topic‚ see Introduction to genetics. For other uses‚ see DNA (disambiguation). The structure of the DNA double helix. The atoms in the structure are colour-coded by element and the detailed structure of two base pairs are shown in the bottom right. The structure of part of a DNAdouble helix Deoxyribonucleic acid (DNA) is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses.
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sharp knife and re-check. Step 4 With a sharp knife‚ strip the outer insulation from the cable‚ taking care not to cut or damage the screening underneath. Twist the screening conductors together as shown. Step 5 Tin the end of the twisted screen‚ leaving 2-3mm of untinned wire remaining. This allows the wire to flex enough for connecting to the IR LED in the next step. Step 6 This is the infra red LED. It has a small bump on one side which acts as a lens. Carefully bend
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for certain traits in the bacteria. Alsa‚ he was a cautious scientist‚ hesitant to publish his research and in the end his work didn’t become well known until after he died in 1955. In 1950‚ a man named Erwin Chargaff discovered that of the 4 base pairs of nucleotides‚ 2 of them had relations with the 2 others. The quantity of adenine was always equal to the quantity of thymine and thus was also true with the other two bases. After he published his research‚ those rules became known as Chargaff’s
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dilapidated house. Chills ran down my spine. I forgot my jacket‚ I thought to myself. The twojackets‚ three pairs of pants‚ 4 pairs of fuzzy socks‚ and boots could not keep me warm against the deathly cold. The walkway up to house were cracked. Weeds emerged out from these cracks. Briars were growing wildly in thick batches by the gate. The moonlight cast a scary glow on the house. Twisted vines ran up the side of house‚ reaching towards the roof. The house’s walls were rotting because of neglect
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DR. FAZLUL ISLAM EXISTENCE OF ETERNAL SOUL Highly energetic chemistry is believed to have produced a self-replicating molecule around 4 billion years ago and half a billion years later the last common ancestor of all life existed. The current scientific consensus is that the complex biochemistry that makes up life came from simpler chemical reactions. The beginning of life may have included self-replicating molecules such as RNA‚ and the assembly of simple cells.1‚ 2 Fig-1: DNA Double Helix
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higher speed to keep up with the evolution of Ethernet. An organization wishing to implement a medical imagery repository would first have to consider what security protocols and policies it would use. Then‚ they should consider using Category 6 twisted pair cabling. These cables are hardier versions of Cat5E‚ but have a higher cost and more capabilities to
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Have you ever wondered why people resemble their parents? The answer to this and other questions about inheritance lies in a specialized branch of biology called genetics. Geneticist found that most aspects of life have a hereditary basis and that many traits can appear in more than one form. For instance‚ human beings have blond‚ or red‚ or brown‚ or black hair. They may have one of several different types of blood‚ one or several colors of skin. Their ear lobes may be attached or free. They may
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4. SEX-LINKED INHERITANCE autosomes—22 pair in people heterosomes—1 pair in people (XY sex chromosomes) XX=female XY=male Red-green color blindness in people: PREVIOUSLY NOTED FROM TUESDAY SEPTEMBER 3‚ 2013 5. No dominance example homozygous black= black chicken homozygous white= white chicken heterozygous= gray 6. Multiple factors Several sets of alleles on entirely different chromosomes affect the expression of a single characteristic. Skin color in people Stature on people
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Section 1 : Identifying the Genetic Material Griffith’s Experiments In 1928‚ Frederick Griffith‚ a bacteriologist‚ was trying to prepare a vaccine against pneumonia. A vaccine is a substance that is prepared from killed or weakened disease-causing agents‚ including certain bacteria. The vaccine is introduced into the body to protect the body against future infections by the disease-causing agent. Griffith discovered that harmless bacteria could turn virulent when mixed with bacteria that cause
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Results are copies of each chromosomes moved to each daughter cell. Meiosis’ specialized cell division happens during reproduction. Cellular division starts just like mitosis; the copied chromosomes come together in pairs‚ or homologous‚ in similar size‚ shape and length. The pairs separate here and go to different daughter cells‚ reducing the number of different kinds of chromosomes even if they are still connected. Then the copies are separated from each type of chromosome group going to a
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