Recent Changes

Tuesday, September 24

  1. 10:01 am

Thursday, September 13

  1. page •Lipids edited ... 3. Steriods: Composed of carbon "skeletons" or rings (at least four) Cholesterol i…
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    3. Steriods:
    Composed of carbon "skeletons" or rings (at least four)
    Cholesterol is athe most abundant steroid and
    Cholesterol is a necessary component of cell membranes to maintain a particular level of fluidity based on the external environment.
    {cholesterol.jpeg}
    (view changes)
    8:30 am
  2. page •Lipids edited ... Composed of carbon "skeletons" or rings (at least four) Cholesterol is a steroid an…
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    Composed of carbon "skeletons" or rings (at least four)
    Cholesterol is a steroid and many other steroids are manufactured from cholesterol: great link on "good" and "bad" cholesterol: http://www.health.harvard.edu/newsweek/Understanding_Cholesterol.htm
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    cell membranes to maintain a particular level of fluidity based on the external environment.
    {cholesterol.jpeg}
    Cholesterol and related lipids: Cholesterol and Related Lipids l
    (view changes)
    8:26 am
  3. page •Lipids edited ... What is a lipid? - compounds that typically have little or no attraction for water (What is o…
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    What is a lipid?
    - compounds that typically have little or no attraction for water (What is our term for this?)
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    and hydrogen. TheyThey can be
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    one another. (Remember,(Remember, C6H12O6. EvenEven disaccharides contain
    Three Types of Lipids:
    1. FatsFats (Triacylglycerides, Triglycerides):
    Fats are composed of a glycerol molecule and three fatty acid chains
    Glycerol is a molecule with three carbons in a row, each with a hydroxide group (We know what that is!)
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    and hydrogens. ThisThis is a
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    that is!) TheyThey link by
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    loss of aa water molecule.
    {http://www.burns-pet-nutrition.co.uk/Images/TRIGLYCERIDE.gif}
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    credited to: http://www.burns-pet-nutrition.co.uk/Images/TRIGLYCERIDE.gifhttp://www.burns-pet-nutrition.co.uk/Images/TRIGLYCERIDE.gif
    {http://biology.clc.uc.edu/graphics/bio104/fat.jpg}
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    credited to: http://biology.clc.uc.edu/graphics/bio104/fat.jpghttp://biology.clc.uc.edu/graphics/bio104/fat.jpg
    Trigylcerides can
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    room temperature. ThinkThink butter vs. olive oil. ThisThis feature is
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    or unsaturated. KeepKeep in mind,
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    electrons.
    2. Phospholipids:Phospholipids:
    Phospholipids are
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    cell membranes. TheirTheir structure helps
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    is amphipathic. WhatWhat does this mean? (The(The prefix 'amphi-'
    Notice in the picture below that the third carbon on the glycerol does not have a fatty acid chain, but instead is attached to a phosphate group.
    {http://kvhs.nbed.nb.ca/gallant/biology/phospholipid_structure.jpg}
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    credited to: http://kvhs.nbed.nb.ca/gallant/biology/phospholipid_structure.jpghttp://kvhs.nbed.nb.ca/gallant/biology/phospholipid_structure.jpg
    3. Steriods:Steriods:
    Composed of carbon "skeletons" or rings (at least four)
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    from cholesterol: greatgreat link on
    Cholesterol is a necessary component of cell membranes
    Cholesterol{cholesterol.jpeg}
    Cholesterol
    and related lipids: CholesterolCholesterol and Related
    (view changes)
    8:26 am
  4. file cholesterol.jpeg uploaded
    8:25 am

Thursday, July 26

  1. 5:12 pm

Wednesday, May 11

  1. page Transcription and Translation edited ... 7. As the growing polypeptide chain begins to leave the ribosome and enter the cytoplasm it be…
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    7. As the growing polypeptide chain begins to leave the ribosome and enter the cytoplasm it begins to fold into its secondary and tertiary structures (see the protein page).
    Link to translation animation:
    Translation Animation #2
    (view changes)
    10:26 am

Tuesday, May 3

  1. page Transcription and Translation edited ... {Pre-mRNA.gif} Above image credited to: http://users.rcn.com/jkimball.ma.ultranet/BiologyPag…
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    {Pre-mRNA.gif}
    Above image credited to: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/T/Transcription.html
    RNA Processing Animation
    Translation:
    What is it?
    (view changes)
    11:10 am
  2. page Transcription and Translation edited ... - RNA polymerase opens the DNA helix and is responsible for linking together the nucleotides t…
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    - RNA polymerase opens the DNA helix and is responsible for linking together the nucleotides to make the mRNA molecule
    {transcription.jpg}
    Transcription Animation
    DNA must be in the form of chromatin in order for translation to occur. RNA polymerase unzips the helix and begins pairing complementary bases to the bases in DNA- adenine must now pair with uracil and cytosine must pair with guanine. This process occurs until the entire gene has been transcribed into mRNA, which will then leave the nucleus and head into the cytoplasm. Prior to RNA leaving the nucleus, however, it must be processed. This means that the introns (sequences of RNA that do not code for the protein) must be removed from the molecule and the exons (the sequences of RNA that code for amino acids) spliced back together. As an added protective measure, a cap is added to the "front" of the molecule and a tail is added at the end. This aids mRNA in being able to leave the nucleus and keeps it from being broken down by enzymes present in the cytoplasm.
    {Pre-mRNA.gif}
    (view changes)
    11:08 am

Monday, May 2

  1. page •Nucleic Acids edited ... Carry the codes to make proteins for the cell 3. Chromosomes and Chromatin ... appear as …
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    Carry the codes to make proteins for the cell
    3. Chromosomes and Chromatin
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    appear as stringy chromatin, which
    Notice the histone proteins around which DNA is wrapped several times.
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    46 chromosomes; over twoaround 6 feet of
    Below image credited to: http://micro.magnet.fsu.edu/cells/nucleus/chromatin.html
    {Chromatin} Chromatin vs. a Condensed Chromosome
    (view changes)
    9:02 am

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