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DNA: Definition, Structure, and Discovery

Student Name: _____ Date: _____ DNA: Definition, Structure, and Discovery 1 Deoxyribonucleic acid or DNA is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell, and are passed down from parents to their children. DNA structure DNA is made up of molecules called nucleotides. Each nucleotide contains a phosphate group, a sugar group and a nitrogen base. The four types of nitrogen bases are adenine (A), thymine (T), guanine (G) and cytosine (C). The order of these bases is what determines DNA's instructions, or genetic code. Similar to the way the order of letters in the alphabet can be used to form a word, the order of nitrogen bases in a DNA sequence forms genes, which in the language of the cell, tells cells how to make proteins.

DNA: Definition, Structure, and Discovery 1 Deoxyribonucleic aci d or DNA i s a mol ecul e t hat cont ai ns t he i nst ruct i ons an organism needs to devel op, l i ve and reproduce. T hese i nst ruct i ons are found inside every c el l , and are passed down …

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Classification - ccmr.cornell.edu

www.ccmr.cornell.edu

whole organizational system for living things is called “classification.” It works like this: Suppose you wanted to classify a car. See Figure 3. The first group, or kingdom, would all be cars. That would exclude trucks, school buses, and RVs. The kingdom of cars would be further divided into all sedans.

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Buoyancy - Cornell Center for Materials Research

www.ccmr.cornell.edu

The Archimedes Principle The mathematician Archimedes, who lived in the third century B.C., is credited with discovering much of how buoyancy works.

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Non-Destructive Testing Reading

www.ccmr.cornell.edu

Leak Testing (LT) Several techniques are used to detect and locate leaks in pressure containment parts, pressure vessels, and structures. Leaks can be detected by using electronic listening devices, pressure gauge measurements, liquid and gas penetrant techniques, or simple soap­bubble tests.

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Trace Evidence – How Fibers and Hair are used to aid in ...

www.ccmr.cornell.edu

Trace Evidence – How Fibers and Hair are used to aid in Crime Solving. Locard’s Exchange Principal – when a criminal comes in contact with a person or object a cross ... Medullas have three general appearances, as well as many different shapes. Deer Medulla (notice it is as thick as the hair) Rabbit Medulla (again the medulla is very large)

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WHAT IS THE SCIENTIFIC METHOD?

www.ccmr.cornell.edu

terms of combinations of air, earth, fire and water. One French scientist, Antoine Lavoisier, (1743-1794) worked to change the way chemistry was done. Lavoisier had a habit of making very careful measurements in his experiments. One of the things he discovered from these experiments was that combustion is the result of a reaction with oxygen.

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Scanning Electron Microscope

www.ccmr.cornell.edu

electron source, optical aberrations of the final lens (objective) and the diffraction aberration on the final aperture. The spot size is smaller at shorter working distances. The incident electron beam is cone-shaped. The vertex angle of the cone is determined by the aperture angle. The wider the cone, the lower the depth of focus.

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www2c.cdc.gov

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www.finra.org

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