Lipids and Phospholipids The main role of phospholipids is that they can form lipid bilayers. It is an amphipathic molecule. The head which is hydrophilic contains a group of phosphate‚ a diglyceride and a simple molecule e.g. choline. The tail is hydrophobic and is made up of fatty acids. Phospholipids receive and transmit signals across the cell membrane and act as a store room for energy. The main role of phospholipids is that they can form lipid bilayers. It is an amphipathic molecule. The
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introduced in each of these varieties for obtaining specific properties. PET Polyester For manufacturing PET Polyester‚ the main raw material is ethylene derived from petroleum. It is oxidized to produce a glycol monomer dihydric alcohol which is further combined with another monomer‚ terephthalic acid at a high temperature in a vacuum. Polymerization‚ the chemical process that produces the finished polyester‚ is done with the help of catalysts. The colorless molten polyester then flows from a slot
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1 HIGHER SECONDARY MODEL EXAMINATION HSE II Max.marks: 60 CHEMISTRY Time: 2.45 hrs General instructions All questions are compulsory Cool-off time is 15 minutes 1] Defects modify the properties of crystals [4 marks] A] Give differences between Schottky and Frenkel defects [2.0] B] On heating zinc oxide becomes yellow in colour. Why? [1.0 ] C] Alkali metal halides on heating in presence of alkali metal produce characteristic colours.Give reason [1.0] 2] Colligative
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AIM: TO MAKE BAKELITE USING PHENOL AND FORMALDEHYDE. INDRODUCTION: WHAT IS BAKELITE? Bakelite or polyoxybenzylmethylenglycolanhydride is an early plastic. It is a thermosetting phenol formaldehyde resin‚ formed from an elimination reaction of phenol with formaldehyde. It was developed by Belgian-born chemist Leo Baekeland in New York in 1907. One of the first plastics made from synthetic components‚ Bakelite was used for its electrical non-conductivity and heat-resistant properties
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REPORT WRITING FOR EXPERIMENT MATERIALS IN PRACTICE CONTENT PAGE Title Page Synopsis 1 Introduction to the background information
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The Origin and Evolution of Life on Earth Why do we start the discussion of biology with a discussion of geology? Here are some reasons why one would do this: * All life on earth is linked to geology; likewise‚ many surface geologic features and processes have been influenced by life on earth. The origin and early evolution of the earth are especially important when looking at the origin and early evolution of life on earth. * Life chemistry had its origin with the elements available to
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Surname Centre No. Candidate No. Paper Reference(s) Initial(s) Paper Reference Signature 7 0 8 1 7081/01 0 1 Examiner’s use only London Examinations GCE Chemistry Ordinary Level Paper 1 Wednesday 12 January 2011 – Afternoon Time: 1 hour 15 minutes Materials required for examination Nil Items included with question papers Nil Team Leader’s use only Question Leave Number Blank 1 2 3 4 5 6 7 8 9 Instructions to Candidates In the boxes above‚ write your centre number
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Laboratory Exercise #3 Measuring Protein in Solution Abstract The purpose of this lab was to learn about the Biuret assay reaction to determine if it can detect proteins and amino acids; also‚ to understand the process of “salting out” proteins and how to determine the amount of protein in a solution. In order to do so‚ egg white and ammonium sulfate were mixed on ice and then put into the centrifuge. After PBS was added‚ the amount of protein could then be determined. After that‚ 14 test tubes
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Artem Ilyayev Ap Bio 1) An element is to a(n) ___________ as an organ is to a(n) _______________ Answer - b - compound; organism 2) In the term trace element‚ the modifier trace means Answer - a - the element is required in very small amounts. 3) Compared to 31P‚ the radioactive isotope 32P has Answer - b - one more neutron 4) Atoms can be represented by simply listing the number of protons‚ neutrons‚ and electrons - for example‚ 2P+; 2n0; 2e- for helium. Which atom represents the 18O isotope
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Pg1Pg1 CONSERVATIVE OPERATIVE DENTISTRY Page 1 Lecture: Bonding Systems (Enamel‚ Dentin‚ Compomer‚ Amalgam‚ Resin Cement) OVERVIEW OF BONDING SYSTEMS: A. Goals of Bonding (and Adhesion): 1. Sealing 2. Retention B. Definitions and Terminology for Adhesion: 1. Terminology for adhesion: a. Adhesive- material forming the layer b. Adherend- substrate being bonded c. System (EBS‚ DBS) and agents (EBA‚ DBA‚ ABA)
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