Problem Set 1 Solutions: Chapters 1 1 Cell sizes: E. coli is a cylindrical bacteria with 1 M wide and 2 M long. Liver cells are approximately spherical with a diameter of 20 M. Plant palisade cells are cylinders 20 M wide and 35 M long. A) Calculate the volumes of each cells? A) Since E.Coli is cylindrical Volume of a cylinder = r2h‚ where r is half of bacterial width/diameter = 1M/2 = 0.5M and h is the length of the bacteria
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1.1 BACKGROUND Every activity in modern life is influenced by plastics and many depend entirely on plastic products due to their useful material properties and low production costs. Almost every product is constituted of some kind of polymer; however‚ traditional synthetic polymers (often called plastics)‚ such as polypropylene and polyethylene‚ are derived from non-renewable petrochemicals and are not readily biodegradable (http://www.plastice.org/ fileadmin/files/Brochure_teachers.pdf). The need
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of DNA 1. What three parts does every nucleotide have? What are the four bases in DNA? 2. List the three main differences between DNA and RNA. 3. Describe the structure of the DNA double helix‚ making use of the following terms or phrases: sugar-phosphate backbone‚ nitrogenous bases‚ helix‚ and complementary base-pairing. What type of chemical interaction holds the strands of a DNA molecule
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experiment by Matthew Meselson and Franklin Stahl in 1958 which supported the hypothesis that DNA replication was semiconservative. In semiconservative replication‚ when the double stranded DNA helix is replicated each of the two new double-stranded DNA helices consisted of one strand from the original helix and one newly synthesized. It has been called "the most beautiful experiment in biology.[1]" Contents [hide] 1 Hypothesis 2 Experimental procedure and results 3 Literature cited 4 External
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Unit 2 Lecture Study Guide – 1) What are the parts of an atom? Where are the subatomic particles found? a) Protons‚ neutrons‚ and electrons b) Protons and neutrons are located in the center of an atom in the nucleus and the electrons are located around the nucleus. 2) How does the Atomic Mass # differ from the Atomic #? The atomic mass number is the sum of the number of protons and neutrons in the nucleus of an element and the atomic number is the number of protons that it has. 3)
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The electron gun is an indirectly heated barium oxide-coated cathode with a Wehnelt cylinder at negative potential for focusing the emanating rays into a nearby anode with a hole in it. The electrons are accelerated from the cathode‚ focused into a helix‚ through the hole in the anode (at positive potential—creating an electric field)‚ thus emerging with kinetic energy‚ K‚ equal to the product of the electron’s charge‚ e‚ and the voltage‚ V (potential difference). Assuming they are emitted with negligible
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Biotechnology and dream of all the great things it could bring to mankind. There are also those who see it as threat to mankind‚ something that could possibly overthrow our current society. James Watson‚ who along with Francis Crick discovered the double helix structure of DNA‚ exerts that this controversy is not deserved. He believes that it is pertinent for our future‚ that it could benefit mankind. Francis Fukuyama‚ a professor at John Hopkins School of Advanced International Studies and author of the
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Biochemistry Essential Elements of Life Carbon‚ hydrogen‚ oxygen‚ nitrogen (96%) Calcium‚ phosphorus‚ potassium‚ sulphur (4%) Isotopes Atoms of an element that differ in neutrons Radioactive isotopes decay spontaneously‚ giving off energy Cohesion Hydrogen bonds hold water molecules together Adhesion is an attraction between two substances Surface tension measures how hard it is to break the surface tension of a liquid Hydrocarbons Organic molecules consisting of only carbon
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Agrodok 47 Snail Farming Production‚ processing and marketing Dr J.R. Cobbinah Adri Vink Ben Onwuka This publication is sponsored by: ICCO © Agromisa Foundation‚ Wageningen‚ 2008. All rights reserved. No part of this book may be reproduced in any form‚ by print‚ photocopy‚ microfilm or any other means‚ without written permission from the publisher. First edition: 2008 Authors: Dr J.R. Cobbinah‚ Adri Vink‚ Ben Onwuka Illustrator: Barbera Oranje Design: Eva Kok Translation: Catharina
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The film Gattaca presents a world in the “not too distant future‚” where human beings are judged and defined solely by their genetic make-up‚ a world in which the scientific determination of one’s existence is placed over faith‚ religion‚ and free-will. Parents have the ability to choose their children’s genes and can essentially create the “perfect” child through ensuring that their best hereditary traits are passed on. Those who are conceived naturally are referred to as “God-children”‚ children
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