&ATOMIC NUMBER AND MASS NUMBERS After reading this section you will be able to do the following: * Define and determine the atomic number of an atom. * Define and determine the mass number of an atom. What is an atom’s atomic number? The number of protons in the nucleus of an atom determines an element’s atomic number. In other words‚ each element has a unique number that identifies how many protons are in one atom of that element. For example‚ all hydrogen atoms‚ and only hydrogen atoms
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motion “Marin General Hospital‚ north of San Francisco‚ where Orwig works‚ has a commanding view of Mount Tamalpais‚ the undulating rise named by the Miwok Indians for its resemblance to a sleeping maiden.” Proliferated(pg.230)- Increase rapidly in numbers‚ multiply. “While one spine surgeon I spoke with still defends his actions against the panel‚ even he admitted that fusion operations have proliferated in the United States.” 3. “Throughout those four
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Biology Major substances: Organic compounds – are compounds that contain carbon and were originally made by living things e.g. carbohydrates‚ lipids‚ proteins‚ nucleic acids Inorganic compounds – are compounds do not contain carbon as a main element Organic compounds | Composition | Function | Proteins | Carbon‚ hydrogen‚ oxygen and nitrogen | Used in the structure‚ storage‚ movement and transport of cells for growth and repair. | Lipids | Carbon‚ hydrogen and oxygen | Stores energy
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1. What is the commonly accepted age of Earth? a. 4.6 million years b. 46 million years c. 4.6 billion years d. 46 billion years 2. Which of the following was not a source of heat for the early Earth? a. meteor bombardment b. gravitational contraction c. radioactivity d. hydrothermal energy 3. What are small asteroids called? a. comets b. meteoroids c. cratons d. microcontinents 4. What is the process by which a planet becomes
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Lab: Inhibiting the Action of Catechol Oxidase By: Kimberly G. Introduction: In this lab‚ Mr. Greene ’s sixth period AP Biology class split into groups "to investigate inhibition of enzyme activity by specific chemicals called inhibitors" (1). Group three pondered this lab ’s inhibitor‚ phenylthiourea (PTU). Is it a competitive inhibitor? That is an inhibitor that literally "competes" with the substrate by mimicking it‚ and thus "wins" the position at the active site of the enzyme. The blocked
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of homologous chromosomes includes one chromosome from each parent. The 46 chromosomes in a human somatic cell are two sets of 23 one from the mother and one from the father. A diploid cell (2n) has two sets of chromosomes. For humans the diploid number is 46 (2n=46). 4) Meiosis is the production of gametes that result in one set of chromosomes in each gamete. Gametes fuse to form a diploid zygote that divides by mitosis and develop into a multicellular organism. 5) Mitosis and meiosis are alike
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The 1920’s were a time of great cultural change in America. Traditionalists found the new values of the Jazz Age to be utterly sinful and immoral. The youth of the twenties rebelled against the constraints of their elders in several ways. One of the most provocative changes was the "new look" for young women. The Flapper Era entered America with a bang. Ladies did the unthinkable in cutting their long tresses to chin length bobs‚ smoking‚ wearing shorter dresses and even engaging
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Presence of Rings. Carbon skeletons can have double bonds in different locations and also different numbers of double bonds. 4.Hydrocarbons only have hydrogen and carbon molecules‚ hence the name. Hydrocarbons are hydrophobic because they mostly consist of hydrogen and carbon bonds that have no charge‚ therefore don’t attract additional bonds. 5.Isomers are compounds made up of the same number of atoms and the same type of elements but configured differently‚ giving them different functions
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Chapter 3 3.1 Identify the functional groups in each of the following molecules: O C NH2 H N O C OH H C CH2 (a) (b) O (c) Solutions: a. b. c. d. Amide‚ double bond Amine‚ carboxylic acid Double bond‚ ketone‚ ester O OCH3 (d) CH2OH Aromatic ring‚ double bond‚ alcohol (a) Alcohol (d) Amine (b) Aromatic ring (e) both ketone and amine (c) Carboxylic acid (f) two double bonds 3.2 Propose structures for simple molecules that contain the following functional groups:
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w w w e tr .X m eP e ap .c rs om June 2003 GCE A AND AS LEVEL MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 9700/01 BIOLOGY Paper 1 (Multiple Choice) Page 1 Mark Scheme A/AS LEVEL EXAMINATIONS – JUNE 2003 Syllabus 9700 Paper 1 Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Key D A C C A C D A B A B C B C D A D A C C Question Number 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Key D B B A C C B B C D A C C D B B D B B C
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