Which of the following types of molecules are the major structural components of the cell membrane? A) phospholipids and cellulose B) nucleic acids and proteins C) phospholipids and proteins D) proteins and cellulose E) glycoproteins and cholesterol For the following questions‚ match the labeled component of the cell membrane (Figure 7.1) with its description. [pic] Figure 7.1 5) peripheral protein 6) cholesterol 9) glycolipid 11) The presence of cholesterol in
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and functioning of all known living organisms. RNA molecules are involved in protein synthesis and sometimes in the transmission of genetic information. However unlike DNA‚ RNA comes in a variety of shapes and types. While DNA looks like a double helix and a twisted ladder‚ RNA may be of more than one type. RNA is usually single-stranded‚ while DNA is usually double-stranded. In addition‚ RNA contains ribose while DNA contains deoxyribose. Deoxyribose lacks one oxygen atom. RNA has the bases Adenine
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to the discovery of DNA how? The amount of adenine always equaled thymine and the amount of cytosine always equaled guanine 12. Wilkins and Franklin contributed to the discovery of DNA how? Founded that DNA molecules ensemble a tightly coiled helix and is composed of 2 to 3 chains of nucleotides 13. What are the three base pairing rules? Purine is always paired with a pyrimidine Adenine always pairs with thymine A-T Cytosine always pairs wit guanine C-G 14. How many hydrogen bonds are
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1. Introduction The Hubble Space telescope has been Orbiting the Earth for over two decades‚ Hubble has helped to answer some of the most compelling astronomical questions of our time – and uncovered mysteries we never knew existed. Investigating everything from black holes to planets around other stars‚ Hubble has changed the face of astronomy‚ ushering in a new chapter of humanity’s exploration of the universe. Although named to honor astronomer Edwin Hubble‚ the telescope was championed by
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Amino acids are the building blocks of proteins. Amino acids bind together to form polypeptide chains‚ and these polypeptides fold and coil together into specific conformations to form proteins. There are 20 different amino acids‚ each amino acid consisting of four distinct partners. The first is a carboxyl group. A carboxyl group has very weak acids that are able to donate hydrogen ions to biological reactions. The second partner is the amino acid group. Amino acid groups act as the base which‚
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called ‘NUCLEIN’ Finally in 1953‚ working together at the University of Cambridge in England‚ James Watson‚ an American scientist‚ and Francis Crick‚ a British researcher‚ made a major scientific breakthrough when they discovered the famous "double helix" - the structure of DNA‚ the molecule of life. In 2000 ‚ a rough draft of a map of entire human genome was completed. In 2003‚the final draft was completed .This information is being used to understand and function of disease. An interesting fact
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Chapter 4: Nucleic Acids and the RNA World 1. 4.1 – What is a Nucleic Acid? * Nucleic acids are made up of monomers called nucleotides * Three components of a nucleotide: 1. Phosphate group—attached to the 5’ carbon 2. Sugar – carbonyl group and several hydroxyl groups 3. Nitrogenous base * The prime (‘) symbols indicate the carbon being is part of the sugar—not attached to the nitrogenous base. * Four different nucleotides‚ each of which contains a different nitrogenous
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For a 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 DNA double 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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CHAPTER.1 INTRODUCTION For decades‚ scientists have been using electromagnetic and sonic energy to serve medicine. But‚ aside from electro surgery‚ their efforts have focused on diagnostic imaging of internal body structures—particularly in the case of x-ray‚ MRI‚ and ultrasound systems. Lately‚ however‚ researchers have begun to see acoustic and electromagnetic waves in a whole new light‚ turning their attention to therapeutic—rather than diagnostic—applications. Current research is exploiting
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Introduction to Biochemistry (CHEM 501) Final Exam 12/17/2007 1. The anaerobic conversion of 1 mol of glucose to 2 mol of lactate by fermentation is accompanied by a net gain of: a) b) c) d) e) 1 mol of ATP. 1 mol of NADH. 2 mol of ATP. 2 mol of NADH. none of the above. 2. The conversion of 1 mol of fructose 1‚6-bisphosphate to 2 mol of pyruvate by the glycolytic pathway results in a net formation of: a) b) c) d) e) 1 mol of NAD+ and 2 mol of ATP. 1 mol of NADH and 1 mol of ATP. 2 mol of NAD+
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