UTF-8The role of charge in attraction between molecules206222206FORM AND FUNCTION
The role of charge in attraction between molecules
While it is true that all molecules, even neutrals ones, attract to each other, there is another attractive force that is even stronger than the van der Waals force - the electrostatic force (or force between charges). Use the model below to explore how charges can help molecules attract to each other.
On the following pages, you will explore how the specific shape of antibody molecules allows them to stick to specific antigen molecules, making ELISA possible.
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<font size="3" face="Verdana, Arial, Helvetica, sans-serif">Try adding
charge to the molecules on the left side of the model and leave the ones
on the right side neutral.</font>
<p>
<font size="3" face="Verdana, Arial, Helvetica, sans-serif">To add
charge click on either button in the toolbar.</font>
</p>
<blockquote>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif"><img height="15" src="addPositiveCharge.gif" width="15">
</font><font face="Verdana, Arial, Helvetica, sans-serif" size="3"> =
add positive charge</font> <font face="Verdana, Arial, Helvetica, sans-serif"><br><img height="15" src="addNegativeCharge.gif" width="15"></font><font face="Verdana, Arial, Helvetica, sans-serif" size="3"> =
add negative charge</font>
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</blockquote>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="3">Then <a href="edge.cml">click
on the edge of the molecule</a> where you want to add charge. </font>
</p>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="3">Run the
model and adjust the temperature to see if you made the molecules stick
together better. Then use the "take a snapshot" button below to record
your results.</font>
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<font size="4"><strong>Describe how you charged your molecules and why
that worked to help them stick to each other better.</strong></font>
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