POB II: Exam II Review Chapter 6: tour of the cell Microscopy: • Microscopes provide a window to the cell. • Most important tool in cytology • Resolution has improved understanding of cells. o Resolving power – the smallest distance between two objects that allows them to be seen as distinct objects. o Resolving power of the human eye is 0.1 mm • Light microscope – uses glass lenses and visible light to form a magnified image of an object. o Resolving power of about 100 nm (.0002 mm)
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with William B. Schwartz‚ who is a professor of medicine at UCLA. Together these two men have edited this essay from which this information was taken from. It was said that in 1953 there were two scientists‚ which were able to identify the double helix that it comprised of four nucleotides that are entwined in the code of all human life. A nucleotide is component of RNA and DNA. Also in 2001 two scientific teams where able to produce human genome draft. This introduced to medical professionals a
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nitrogenous bases in DNA. Two of the nitrogenous bases‚ adenine and guanine‚ belong to a group of compounds known as purines. The remaining two bases‚ cytosine and thymine‚ are known as pyrimidines. The actual DNA structure is seen as a double helix in which two strands are wound around each other. Each strand is made up of a chain of nucleotides. The two strands are held together by hydrogen bonds between adenine and thymine and between guanine and cytosine. In 1944‚ a group of scientists
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Scientist with Their Contribution Dr Adam Rutherford tells the extraordinary story of the scientific quest to discover the secrets of the cell and of life itself. Every living thing is made of cells‚ microscopic building blocks of almost unimaginable power and complexity. The first part explores how centuries of scientific and religious dogma were overturned by the earliest discoveries of the existence of cells‚ and how scientists came to realize that there was‚ literally‚ more to life than meets
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By: Robert E-mail: an@cancom.net Men and Women were Created Equal Men are not superior to women‚ they are equal in every way. Although it is true that society has stereotyped women into traditional roles‚ this preconceived notion‚ is totally false. Action to promote the concept of equality in our society needs to be taken. Women have been fighting for equality for many decades. As a result of this battle‚ some amazing transformations have taken place amongst the female gender. Women have become
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Biochemistry Introduction DNA is a double-stranded molecule of polynucleotide chains twined/twisted together into a double helix structure. This molecule is the one that forms the genetic material responsible for transfer hereditary genetic information from one cell to another during cell division. RNA is a single-stranded molecule that contains polynucleotide chain used for the transfer of genetic information especially in bacteria cells (Freifelder‚ 2002). DNA replication process DNA replication
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temperature is the effect of the thermal energy arising from the motion of microscopic particles[2] such as atoms‚ molecules and photons. The relation is proportional as given by the Boltzmann constant. Thermal vibration of a segment of protein alpha helix. The amplitude of the vibrations increases with temperature. The lowest theoretical temperature is called absolute zero‚ however it cannot be achieved in any actual physical device. It is denoted by 0 K on the Kelvin scale‚ −273.15 °C on the Celsius
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semiliquid inside the plasma membrane of a cell; contains various macromolecules and organelles in solution and suspension. deoxyribonucleic acid (DNA) - A nucleic acid composed of two polynucleotide strands wound around a central axis to form a double helix; the repository of genetic information. Nucleic acid that functions as the physical carrier of inheritance for 99% of all species. The molecule is double-stranded and composed of two strands in an antiparallel and complementary
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DNA Extraction Lab I. Problem Statement: Successfully extracting the DNA from strawberries. II. Background info: DNA is the genetic information in organisms that codes for proteins‚ and controls the cells function. The DNA is a double helix molecule that is formed by various nucleotides which include Adenine‚ Thymine‚ Guanine‚ and Cytosine with sugar phosphate. Different organisms can have larger or smaller genes. DNA is also what makes up chromosomes during cell replication. Strawberries
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These bases will always combine the same way‚ Adenine and Thymine combine together and Guanine and Cytosine combine together. All bases are held together by a hydrogen bond‚ the ladder is twisted into a spiral shape‚ it’s often known as a double helix. The DNA in a cells is used to form a code for cell metabolism. The metabolism is governed by enzymes‚ these catalyse all reactions within the cell. The enzymes are proteins and the particular stretch of DNA forms the code needed for production of
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