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Protein Folding: Page 2
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See All Twenty 3D Rotatable Amino Acids Here
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<p class="pagetitle"><strong>Protein Folding:</strong> Amino acids </p>
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<td><img src="chargeMainIdea.png" width="98" height="58"></td>
<td><p class="mainidea">The primary structure of a protein is a string of amino acids, each with a unique sidechain.</p></td>
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<p class="firstp">
Proteins are made of long strings of the twenty different amino acids.
In the image to the left, each "bead" in the string is an amino acid.
Each letter on a bead stands for one of the 20 common amino acids in the
human body. In fact, all life forms on earth use the 20 common amino
acids to make strings of protein.
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Every amino acid has a part that is that is unique, called the <b>side
chain</b>, and a part that is the same in all the amino acids, called
the <b>backbone</b>. The side chains give proteins their distinct
abilities and functions, and help the protein to fold into the correct
shape. The backbone parts form the string that holds the amino acids
together. Different proteins are made by stringing together different
numbers and types of amino acids.
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<p class="firstp">
On the right, each amino acid is represented in 3 ways: as a molecuar
structure, as a "bead", and by an abbreviation.
</p>
<p>
<b>Look closely at the 2 ball-and-stick structures for Alanine and
Phenylalanine on the right. Can you pick out the atoms that make them
unique?</b>
</p>
<ul>
<li>
Use the button below the image to take a snapshot.
</li>
<li>
Then, use the annotation tool <img src="annotation-circle.gif"> in the
snapshot to circle the atoms that make them different - that is, the
atoms of each one's <b>side chain</b>.
</li>
</ul>
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<p class="question">
Use the link above to open and explore the 20 rotatable 3D amino acids.
Then select the "Sidechain" color scheme. The atoms that are colored
gray are the same in every amino acid. What is the name for this part of
every amino acid?
</p>
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true
the sidechain
the backbone
the protein
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<p class="question">
On the page of 3D amino acids, find <u>lysine</u> and <u>serine</u>. Use
the different color schemes to select the true statement(s) below. (More
than one statement may be true).
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true
they are both polar amino acids
one is polar and the other is non-polar
one of them is charged
they are both non-polar
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