BMS 424 Chapter 1 DNA‚ RNA‚ Historical Experiments & Structures Frederick Griffith Experiments with Streptococcus pneumoniae S. pneumoniae comes in two strains‚ smooth and rough strains S Smooth : Secrete a polysaccharide capsule; Protects bacterium from immune system of hosts; Produce smooth colonies on solid media. R Rough : Unable to form capsule; Produce colonies with a rough appearance. Griffith conducted experiments in 1928 using two strains of S. pneumoniae: type IIIS and type IIR :
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BIO 101 – HUMAN BIOLOGY Midterm Exam I – Fall 2007 Please fill in your name and (SOLAR) ID number on your answer sheet before starting. Do not write anything under the column marked birthdate!!!!! Keep the opscan sheet that came with your test and do not use ANY other opscan form or you risk a misgrading. Answers to the multiple choice questions must be filled in on the answer sheet with a #2 pencil. There are 40 multiple choice questions. Answer sheets will be collected when time is called at 8:10
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Name___________________________________________ Chem 111 Practice Exam 1 Summer 2014 (60 points) MULTIPLE CHOICE. Choose the answer that best completes the statement or answers the question. 1) Round off 807509 to four significant figures. a. 8076 b. 00 81 c. 8100 d. 8.075 × 105 2) Convert 5.100 × 10-3 to ordinary notation. a. 5100 b. 0.0005100 c. 510.0 d. 0.005100 3) To the correct number of significant figures‚ an automobile traveling at 28
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Biology Midterm Review Chapter 2- The Chemical Basis of Life 1: Atoms - The smallest functional units of matter that form all chemical substances - Cannot be further broken down into other substances by ordinary chemical or physical means - Each specific type of atom is a chemical element Three Subatomic Particles: - Protons – Positive (+1)‚ found in nucleus‚ same number as electrons - Neutrons – Neutral (0)‚ found in nucleus‚ number can vary - Electrons – Negative (-1)‚ found
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electron of the radioactive atom is also necessary to the process. Rutherford’s team had also demonstrated artificially induced nuclear transmutation. Nuclear transmutation is the change of an atom of one chemical element or isotope into an atom of another element or isotope. This can either
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Estimation from the Auricular Surface of the Ilium: A Revised Method Buikstra‚ J.E. and Ubelaker‚ D.H. 1994. Standards for Data Collection from Human Skeletal Remains. De Niro M. J. 1985. Postmortem Preservation and Alteration of in Vivo Bone Collagen Isotope Ratios in Relation to Paleodietary Reconstruction Esselen‚ W.B.‚ Fellers‚ C.R. and Isgue‚ 1937. Vitamins A‚ C and D in maize as affected by variety and stage of growth 10. Fazekas‚ I.G. and Kósa‚ F. 1978. Forensic Fetal Osteology. Budapest: Akadémiai
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been proven to have a negative effect on plants and the environment. Ruthenium is the only group eight element not to have two electrons in its outer shell. There are seven natural and stable isotopes of ruthenium‚ in addition to thirty-four radioisotopes. Furthermore‚ the most stable of its radioactive isotopes only has a half-life of 373 days‚ while most of the others
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Core 1 summary notes 1) Fossils fuels provide both energy & raw materials such as ethylene‚ for production of other substances Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum Catalytic cracking is the process whereby high molecular weight fractions are broken down to low molecular weight ones. This process is used in petroleum refineries where crude oil is broken down to smaller alkenes and alkanes‚ until ethene‚ propene‚
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assignment. Your work has been submitted to your instructor. Total score: 25 out of 100‚ 25% Question Feedback Question 1 of 20 The subatomic particles that play the greatest role in cellular chemical reactions are electrons. protons. neutrons. isotopes. 0 out of 5 The correct answer is: electrons. Question 2 of 20 The structural unit that retains the properties of an element is the molecule. atom. cell. electron. 5 out of 5 Correct!! Question 3 of 20 Which of the following are found
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C2 REVISION – CHAPTER 1 – STRUCTURE & BONDING Fill in the gaps: When two elements react together they make a _________ substance called a_________. It is _________ to separate the elements after the reaction. Some atoms react by sharing electrons. We call this _________ bonding. Other atoms react by _________ or _________ electrons. We call this _________ bonding. When atoms react in this way they get the electronic structure of a _________ gas. Use pictures and words to describe each type of bonding:
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