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Proteins and Nucleic Acids: What Makes Amino Acids Different?
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This page is just not where I want it to be. But I know you need it yesterday, so I feel I must turn it over to you even though
it falls far short and is on the boring side. Just not enough time....
Qian, is there any way to get the combo boxes to expand all the way, to include all the choices, instead of using a scroll bar?
I think students may not scroll to see that there are 20 amino acids listed.
Surfaces: on | off
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<p class="pagetitle"><strong> Proteins and Nucleic Acids</strong>: What Makes Amino Acids Different? </p>
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<body class="mainidea">
<table border=0 cellpadding=0 cellspacing=0>
<tr>
<td><img src="atomMainIdea.png" width="98" height="58"></td>
<td><p class="mainidea">Twenty different amino acid monomers are used in making all the proteins on Earth. What do they all have in common? How do they differ? Explore!</p></td>
</tr>
</table>
</body>
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<img width="33" src="atomsBullet.png" height="23">
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<td>
<p class="subhead">
Amino acids' unique side chains
</p>
</td>
</tr>
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</body>
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<p class="firstp">
<b>All amino acids have one part that is unique, called the side
chain</b>. The side chain gives each amino acid a different
chemical "personality" - a distinct size, shape, and distribution
of charge. <b>For example,</b> an amino acid side chain may be
large, bulky, and polar, or small and nonpolar, or ... there are
20 different combinations!
</p>
<p>
The rest of the monomer is used to link the amino acids together,
and becomes a part of the backbone of the protein. This part is
the same in all amino acids.<br><br><!--and consists of a carbon atom with
three "groups" attached to it: an <b>amino group (NH<font size="3"><sub>3</sub><sup>+</sup></font>),
a carboxyl group (COO<font size="3"><sup>-</sup></font>), and a
hydrogen atom.</b>-->
</p>
</td>
<td valign="top">
<img src="sidechain2.gif">
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</table>
</body>
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<p class="subhead">
Every surface tells a story
</p>
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</table>
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Execute native script
Choose from the polar amino acids
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Choose from the nonpolar amino acids
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<b>Comparing side chains </b>
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<p class="firstp">
Every amino acid has a different chemical personality, due to the
differing properties of its side chain. <b>These properties include</b>
shapes and sizes - small, medium, large, bulky, skinny; and how the
surface charges are distributed: polar, charged, or non-polar.<br><b>What
to do: </b>Use the menus (above left) to select amino acids to compare.
Use the links below to view the charges at the surface of the side
chains.
</p>
</body>
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<b>Take 3 snapshots of amino acids: </b>
</p>
<ul>
<li>
<b>1. Find an amino acid with a large side chain. In your snapshot,
circle the side chain using the <img src="circleAnnotation.gif"> tool.
(Make sure the surface is NOT shown). </b>
</li>
<li><br>
<b>2. Find amino acids with polar, nonpolar and charged side chains.
Take a snapshot of each and describe what the colors mean in each one. </b>
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Large side chain:
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Polar side chain:
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Nonpolar side chain:
</p>
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Charged side chain:
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