| | Answers are attached Enjoy Biology‚ 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir
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Bose–Einstein condensate From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search Velocity-distribution data of a gas of rubidium atoms‚ confirming the discovery of a new phase of matter‚ the Bose–Einstein condensate. Left: just before the appearance of a Bose–Einstein condensate. Center: just after the appearance of the condensate. Right: after further evaporation‚ leaving a sample of nearly pure condensate. A Bose–Einstein condensate (BEC) is a state of matter
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1. Prehistoric Times - Beginning of the Christian Era (Black Magic) Existence of Fire Arguably the first chemical reaction used in a controlled manner was fire. However‚ for millennia fire was simply a mystical force that could transform one substance into another while producing heat and light. Fire affected many aspects of early societies. These ranged from the simplest facets of everyday life‚ such as cooking and habitat lighting‚ to more advanced technologies‚ such as pottery‚ bricks‚ and
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IB Questionbank Physics Energy‚ Power and Climate 1. In which of the following places will the albedo be greatest? A. B. C. D. A forest A grassland An ocean A polar ice cap (Total 1 mark) 2. A spherical black body has absolute temperature T1. The surroundings are kept at a lower absolute temperature T2. What is the net power per unit area lost by the body? A. B. C. D. σT14 σT24 σ(T14 – T24) σ(T14 + T24) (Total 1 mark) IB Questionbank Physics 1 3. What is the unit of surface heat capacity
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enrichment process. Natural uranium is composed of three isotopes: uranium-238‚ uranium-235‚ and uranium-234. The proportions of each in natural uranium are: uranium-238 99.28 percent‚ uranium-235 0.71 percent‚ and uranium-234 0.0058 percent by mass. The difference in each isotope comes from the number of neutrons. All the isotopes have number of protons which is 92. Uranium-238‚ 235‚ and 234 have 146‚ 143‚ and 142 neutrons respectively. All isotopes of uranium are radioactive. DU is considerably less
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gases. * These five toxic‚ non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ and astatine (At). * Although astatine is radioactive and only has short-lived isotopes‚ it behaves similar to iodine and is often included in the halogen group. * Since the halogen elements have seven valence electrons‚ they only require one additional electron to form a full octet. This characteristic makes them more reactive
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The Manhattan Project was secret military project created in 1942 to produce the first US nuclear weapon. The Manhattan Project basically arrived from the ideals and fears of a Nazi Germany having access to nuclear capabilities during the war‚ and the threat of them using those nuclear weapons was at an all time high during the reign of Hitler. In order to combat this alarming problem‚ the United States government/military started a top secret program to help develop the world’s first nuclear weapon
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(2001). "Cosmic Background Reduction In The Radiocarbon Measurement By Scintillation Spectrometry At The Underground Laboratory Of Gran Sasso". Radiocarbon 43 (2A): 157–161. Parrish‚ Randall R.; Noble‚ Stephen R.‚ 2003. Zircon U-Th-Pb Geochronology by Isotope Dilution – Thermal Ionization Mass Spectrometry (ID-TIMS). In Zircon (eds. J. Hanchar and P. Hoskin). Reviews in Mineralogy and Geochemistry‚ Mineralogical Society of America. 183-213. Wilkins‚ A. (2011‚ January). A History of Supercontinents on Planet
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Ionic compound: is a chemical compound in which ions are held together by lattice structure by ionic bonds Types of Radiations: Alpha‚ Beta and Gama Half life - The time taken for the radioactivity of a specified isotope to fall to half its original value. Characteristics of living things: reproduces‚ respiration‚ Organic matter refers to that matter which is form a once a living organism and is capable of decay. It also entails the composition of organic compounds. Organic matter comes from
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difference in mass of isotopes of the same element is due to the different number of protons in the nucleus. The difference in mass of isotopes of the same element is due to the different number of neutrons in the nucleus. T 6. The isotope carbon-12 is used as the relative mass standard for the atomic mass scale. F 7. The mass of the most common isotope of each element is listed on the periodic table. The average mass of the naturally occurring isotopes of each element is listed
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