Recent Changes

Tuesday, May 27

  1. page home edited Welcome to the IB Chemistry Human Biochemistry Wiki This wiki is for the old syllabus for last …

    Welcome to the IB Chemistry Human Biochemistry Wiki
    This wiki is for the old syllabus for last exams in May 2008
    You are going to use this space to create your own body of knowledge as a class for the Human Biochemistry option. The aim of the wiki is for you to learn about the chemistry of important molecules in the human body needed for good health. Although the structures of complex biological molecules will be used you are not expected to memorize them. You will however need to recognize functional groups and the types of bonding within molecules.
    Expectations
    (view changes)
    7:46 pm

Friday, May 2

  1. page home edited {http://ibchemistry.wikispaces.com/i/c.gif} Welcome to the IB Chemistry Human Biochemistry Wik…
    {http://ibchemistry.wikispaces.com/i/c.gif}
    Welcome to the IB Chemistry Human Biochemistry Wiki
    You are going to use this space to create your own body of knowledge as a class for the Human Biochemistry option.
    The image “http://ibchemistry.wikispaces.com/i/c.gif” cannotaim of the wiki is for you to learn about the chemistry of important molecules in the human body needed for good health. Although the structures of complex biological molecules will be displayed, becauseused you are not expected to memorize them. You will however need to recognize functional groups and the types of bonding within molecules.
    Expectations
    SL students need to make a minimum of two contributions to each of the sections C.1 to C.6
    HL students need to make a minimum of two contributions to each of the sections C.1 to C.9
    These contributions should comprise of about 50% adding new information and 50% editing the contributions of others.
    SL students should make approximately 15 hours of contributions and HL students 23 hours.
    Guidelines
    1. All sources of information from print text need to be acknowledged.
    2. For web based sources (photos, text etc) a link to
    it needs to be made.
    3. Contributions should be an concise and directly relate to the verb used in the assessment statement.
    4. Diagrams, images, equations, video should be used as much as possible.
    5. Information should be presented clearly and concisely under each assessment statement and have very few errors in grammar, sentence construction, spelling, capitalization and punctuation.
    6. Don't change or delete any of the pages or assessment statements.
    7. As with all wiki's the accuracy of your contributions will be reviewed and edited where necessary by an expert.
    Sources:
    Click4biology is an IB Biology site that has helpful material. Check out Chemistry of Life and Proteins and Nucleic Acids.
    Advanced Chemistry by Clugston and Flemming, OUP, Chapter 30 Biochemistry
    Chemistry for the IB Diploma Study Guide by Geoff Neuss, 2001, Oxford University Press, pages 93-104
    Chemistry by John Green and Sandru Damji, IBID Press, 2nd Edition, pages 459-508
    IB Chemistry data booklet
    contains errors.the structures of important molecules
    Advanced Biology, by Michael Kent, OUP
    Chemistry, Zumdhal, 5th edition, Chapter 23
    IB Diploma Chemistry Course Companion by Geoff Neuss, OUP
    International Baccalaureate Organization Chemistry Syllabus, February 2001
    International Baccalaureate IB Chemistry Data Booklet, March 2003

    (view changes)
    12:16 am
  2. page home edited Welcome to the IB Chemistry Human Biochemistry Wiki You are going to use this space to create y…

    Welcome to the IB Chemistry Human Biochemistry Wiki
    You are going to use this space to create your own body of knowledge as a class for the Human Biochemistry option.
    {http://ibchemistry.wikispaces.com/i/c.gif} The aim of the wiki is for you to learn about the chemistry of important molecules in the human body needed for good health. Although the structures of complex biological molecules willimage “http://ibchemistry.wikispaces.com/i/c.gif” cannot be used you are not expected to memorize them. You will however need to recognize functional groups and the types of bonding within molecules.
    Expectations
    SL students need to make a minimum of two contributions to each of the sections C.1 to C.6
    HL students need to make a minimum of two contributions to each of the sections C.1 to C.9
    These contributions should comprise of about 50% adding new information and 50% editing the contributions of others.
    SL students should make approximately 15 hours of contributions and HL students 23 hours.
    Guidelines
    1. All sources of information from print text need to be acknowledged.
    2. For web based sources (photos, text etc) a link to
    displayed, because it needs to be made.
    3. Contributions should be an concise and directly relate to the verb used in the assessment statement.
    4. Diagrams, images, equations, video should be used as much as possible.
    5. Information should be presented clearly and concisely under each assessment statement and have very few errors in grammar, sentence construction, spelling, capitalization and punctuation.
    6. Don't change or delete any of the pages or assessment statements.
    7. As with all wiki's the accuracy of your contributions will be reviewed and edited where necessary by an expert.
    Sources:
    Click4biology is an IB Biology site that has helpful material. Check out Chemistry of Life and Proteins and Nucleic Acids.
    Advanced Chemistry by Clugston and Flemming, OUP, Chapter 30 Biochemistry
    Chemistry for the IB Diploma Study Guide by Geoff Neuss, 2001, Oxford University Press, pages 93-104
    Chemistry by John Green and Sandru Damji, IBID Press, 2nd Edition, pages 459-508
    IB Chemistry data booklet
    contains the structures of important molecules
    Advanced Biology, by Michael Kent, OUP
    Chemistry, Zumdhal, 5th edition, Chapter 23
    IB Diploma Chemistry Course Companion by Geoff Neuss, OUP
    International Baccalaureate Organization Chemistry Syllabus, February 2001
    International Baccalaureate IB Chemistry Data Booklet, March 2003
    errors.
    (view changes)
    12:14 am

Sunday, February 10

  1. page home edited ... SL students should make approximately 15 hours of contributions and HL students 23 hours. Gui…
    ...
    SL students should make approximately 15 hours of contributions and HL students 23 hours.
    Guidelines
    ...
    to be acknowledged at the bottom of the page.acknowledged.
    2. For web based sources (photos, text etc) a link to it needs to be made.
    3. Contributions should be an concise and directly relate to the verb used in the assessment statement.
    (view changes)
    9:42 pm

Wednesday, February 6

Saturday, January 26

  1. page C.4.1 edited ... Fatty Acids: {fattyacid.gif} ... a carboxylic acid / alkanoic acid group When one glyc…
    ...
    Fatty Acids:
    {fattyacid.gif}
    ...
    a carboxylic acid / alkanoic acid group
    When one glycerol molecule and three fatty acid molecules combine in a condensation reaction, one fat molecule (trigyceride) is formed and three molecules of water.
    Triglyceride:
    (view changes)
    6:40 pm

Wednesday, January 16

  1. page C.2.4 edited ... Figure 1.1: Primary Structure of Protein Secondary structure ... occur within the a sing…
    ...
    Figure 1.1: Primary Structure of Protein
    Secondary structure
    ...
    occur within thea single protein chain,
    If the Hydrogen bonds occur between different protein chains, the protein forms a sheet β-sheet or beta pleated sheet.
    {moz-screenshot.jpg} {moz-screenshot-1.jpg} {http://www.chem.ucsb.edu/%7Emolvisual/Img/142A/alpha_helix_bckbone.png}
    (view changes)
    3:56 am

Monday, January 14

  1. page C.2.3 edited ... H2N-CH2-COOH + H+ ---› +H3N-CH2-COOH At high basic pH above the isoelectric pH the carboxylic…
    ...
    H2N-CH2-COOH + H+ ---› +H3N-CH2-COOH
    At high basic pH above the isoelectric pH the carboxylic acid group acts as a bronsted-lowry acid and loses a proton to the base.The amino acid becomes negatively charged. (Structure A). Structure B is called a zwitterion. The amino group has gained a proton and the carboxyl group has lost a proton giving an amino acid with both a positive and negative charge.
    ...
    ---› H2N-CH2-COO- ++ H+
    Electrophoresis
    1. Heat the protein to a high temperature with concentrated HCl to hydrolyze the protein / break it down into individual amino acids / break the peptide bonds.
    2. The amino acid sample is placed in the centre of the gel that is placed in a buffer solution of known pH and a potential difference / voltage applied between the positive anode and negative cathode (as in electrolysis). The gel containing the amino acids is placed in a buffer solution. The buffer keeps the pH constant so as to prevent an change in the charge on the amino acids.
    ...
    acid, the buffer solution acts as the acid and the amino acid as the base and will accept a proton. The positive ion
    ...
    acid, the buffer will act as a base and the amino acid as an acid and donate a proton. A negative ion
    4. When the amino acids are separated the gel is developed with ninhydrin to make the amino acids visible.
    5. The distances the amino acids have traveled can be compared with standing values or compared with their isoelectric points.
    (view changes)
    4:16 am
  2. page C.2.3 edited ... The structure of glycine changes at different pH levels. At its isoelectric point: the pH val…
    ...
    The structure of glycine changes at different pH levels.
    At its isoelectric point: the pH value, which is unique for each amino acid, at which an amino acid carries no net electrical charge and exists as a zwitterion (a molecule that carries both positive and negative charges) - the charge on the amino acid is 0. This is because its charges are balanced because the amino acid has a positive NH3+ group and a negative charge COO- group . Each amino acid has a unique isoelectronic point, and because of this an individual amino can be identified. Table 20 of the Chemistry data booklet has a table of amino acids and their pH at their isoelectric point.
    ...
    bronsted-lowry base (think acid base reaction with the buffer as the acid and the amino acid as the base). The amino acid gains a
    ...
    (Structure C). At
    H2N-CH2-COOH + H+ ---› +H3N-CH2-COOH
    At
    high basic
    ...
    negative charge.
    H2N-CH2-COOH ---› H2N-CH2-COO- + H+

    Electrophoresis
    1. Heat the protein to a high temperature with concentrated HCl to hydrolyze the protein / break it down into individual amino acids / break the peptide bonds.
    (view changes)
    4:13 am

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