Amino Acids Glycine is the smallest of the amino acids. It is ambivalent‚ meaning that it can be inside or outside of the protein molecule. In aqueous solution at or near neutral pH‚ glycine will exist predominantly as the zwitterion. Alanine is a hydrophobic molecule. It is ambivalent‚ meaning that it can be inside or outside of the protein molecule. The α carbon of alanine is optically active; in proteins‚ only the L-isomer is found. Serine differs from alanine in that one of the methylenic
Premium Amino acid
The picture above shows a typical gel electrophoresis set up. The clear container in the center of the picture is called a gel electrophoresis chamber. It contains the agarose gel that will be loaded with genetic material‚ as well as a buffer solution. It is connected to a DC power supply via electrodes. This picture was taken at Paw Print Genetics laboratory in Spokane‚ Washington. Viney and Fenton (1998) defined the term electrophoresis as‚ “the migration of charged particles through a static medium
Premium Electric charge Electromagnetism Electron
香港考試及評核局 HONG KONG EXAMINATIONS AND ASSESSMENT AUTHORITY 香港中學文憑考試 HONG KONG DIPLOMA OF SECONDARY EDUCATION EXAMINATION 練習卷 PRACTICE PAPER 化學 試卷一 CHEMISTRY PAPER 1 評卷參考 MARKING SCHEME (2012年2月22日修訂稿) (updated as at 22 Feb 2012) Hong Kong Examinations and Assessment Authority All Rights Reserved 2012 PP-DSE-CHEM 1–1 權版留保 局核評及試考港香 © 。旨之巧技用運與力能解理重着試考違有亦 ，難解及對應懂學，習學善改生學助無既，度態習學種這。吞生剝 活，記死背硬，案答準標為視考參卷評將應不生學。用之考參生學 和師教供，寫編而卷習練科本為專局核評及試考港香乃考參卷評本 This marking scheme has been prepared by the Hong Kong
Premium Chemical reaction Chemistry Gospel of Mark
LAREDO COMMUNITY COLLEGE Science Department CHEM 1411-1412 Practice Test Ch. 7 Periodic Properties Newton Name Instructions: Circle the letter of the BEST answer(s). Some questions may have multiple answers; be sure to include all correct answers. Each correct question is worth two (2) points. 1) __________ is credited with developing the concept of atomic numbers. A) Lothar Meyer B) Ernest Rutherford C) Michael Faraday
Free Periodic table
observation‚ which each reagent produce when mixed with another reagent. After careful observation‚ be able to prove each observation using the net ionic equation. Background: First‚ a double-replacement reaction is when two cations in different compound switch anions‚ AX + BZ → BY. If either compounds are insoluble a precipitate occurs‚ and if there is no precipitate formed there is no reaction. Also‚ not all ionic compounds are soluble in water‚ and there are a few solubility rules that need
Premium Chemical reaction Chemistry Sodium
3.1 BIOLOGICAL MEMBRANES 3.1.1 Properties of Cell Membranes • Separates living cell from its nonliving surroundings. • 8 nm thick. • Selectively permeable - allows some substances to cross more easily than others. 4.1.2 Fluid Mosaic Model • Singer and Nicolson (1972) - plasma membrane is a mosaic of proteins dispersed within lipid bilayer‚ with only bilayer‚ the hydrophilic regions exposed to water. Hydrophilic region of protein Phospholipid bilayer Hydrophobic region of protein
Premium Cell membrane Cell Osmosis
The Potential of Malunggay (MORINGA OLEIFERA) Leaf Extract as an Alternative Source of Electricity A Research Proposal By Raymundo Jonieve B. Lanoy Submitted to the Faculty of the Tagbilaran City Science High School In partial fulfillment of the requirements for Research IC January 2014 CHAPTER 1 THE PROBLEM: RATIONALE AND BACKGROUND Electrical phenomena have been studied since antiquity‚ though progress in theoretical understanding remained slow until the seventeenth and
Free Electrochemistry Battery Electricity
Chemical bond From Wikipedia‚ the free encyclopedia A chemical bond is an attraction between atoms that allows the formation of chemical substances that contain two or more atoms. The bond is caused by the electrostatic force of attraction between opposite charges‚ either between electrons and nuclei‚ or as the result of a dipole attraction. The strength of chemical bonds varies considerably; there are "strong bonds" such ascovalent or ionic bonds and "weak bonds" such as dipole–dipole interactions
Premium Chemical bond Covalent bond
Xe (54) 2‚ 8‚ 18‚ 18‚ 8 Rn (86) 2‚ 8‚ 18‚ 32‚ 18‚ 8 The tendency for atoms to have eight electrons in the outer shell is known as Octet rule. IONIC BOND Definition: The electrostatic attraction between the cation (+ve ions) and anions (-ve ions) produced by electron transfer constitutes an ionic or electrovalent bond. Conditions for formation of ionic bond: 1) Bond formations occur between the metal and nonmetal. Metal is donor and nonmetal is acceptor. 2)
Premium Chemical bond Atom Covalent bond
for the solubility equilibrium between an ionic solid and its ions is called solubility constant [1] ‚ Ksp of the solute. For example‚ the solubility product is defined by MxAy(s) ⇋xM(aq)y++ yA(aq)x- (1) Where M is the metal cation‚ A is the anion‚ x and y are the corresponding charges of the ions. The equilibrium expression is Ksp=[MY+]x[AX-]Y (2) In the example‚ MxAy(s) does not appear in the equilibrium constant expression since its activity is 1 and does not
Premium Chemistry Solubility Chemical equilibrium