Chemistry All about matter There are three different stages of matter: Solid‚ Liquid and Gas Solid (s): Have a certain volume and shape. “Particles” are arranged in a specific crystalline patter and they only vibrate around fixed positions. Liquid (l): Have a fixed volume‚ but not shape. The particles have some freedom and can move around each other. They collide often. Gas (g): Doesn’t have a fix volume or shape. (Takes up the space where it is) Particles move freely in all space available
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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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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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They asked which part of the virus is responsible to enter the E. coli cell during infection‚ DNA or protein? In their experiment‚ they used radioactive isotopes to tag phage DNA (radioactive phosphorus) and protein (radioactive sulfur) because protein contains sulfur and DNA contains phosphorus hence the reason behind the radioactive isotopes. They then allowed separate samples of nonradioactive E. coli cells to be infected by the protein and DNA labeled batches of T2. Then they tested to see which
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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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Hershey and Chase Experiment In 1953‚ Alfred Hershey and Martha Chase confirmed DNA’s preeminent role in genetics by demonstrating that DNA is the genetic material of a virus called phage T2. The phage‚ which infects E. coli‚ consists of a head‚ sheath‚ tail‚ and base plate made of different proteins. DNA is packaged within the head of the virus. When T2 comes in contact with E. coli‚ the phage attaches to the bacterium by its tail. Next‚ the phage injects genetic material into the cell. The genetic
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Chapter 2 The Chemical Context of Life PowerPoint Lectures for Biology‚ Seventh Edition Neil Campbell and Jane Reece Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Overview: Chemical Foundations of Biology Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • The bombardier beetle uses chemistry to defend itself Figure 2.1 Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Concept 2.1: Matter consists
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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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