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<h2 class="hd hd-2 unit-title">Reference Summary</h2>
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<h3> <b> Lipids </b> </h3>
<p> Lipids are non-polar and hydrophobic. </p>
<img src='/assets/courseware/v1/b3d984d99c160d0fbb48300f6908b596/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/d1.png' alt="This image is of trans-oleic acid: CCCCCCCCC=CCCCCCCCC(=O)O">
<br /> <br /> <br /> <br />
<h3> <b> Carbohydrates </b> </h3>
<p> Carbohydrates follow the formula CH<sub>2</sub>O and are polar.</p>
<img src='/assets/courseware/v1/a3edeeeee50ac28d43ce98f21f8fbc00/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/d2.png' alt="This image is of glucose: C(C(C(C(C(C=O)O)O)O)O)O">
<br /> <br /> <br /> <br />
<h3> <b> Proteins </b> </h3>
<p> Proteins are made up of amino acid monomers, which consist of an α-carbon (circled in red) bound to an NH<sub>2</sub> group, a COOH group, and a side chain, or R group, (circled in blue). The R group can be polar or non-polar </p>
<img src='/assets/courseware/v1/26b6438baff43ec5ee2a1426f2c7493d/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/d3.png' alt="This image is of valine: CC(C)C(C(=O)O)N">
<br /> <br /> <br /> <br />
<h3> <b> Nucleic Acids </b> </h3>
<p> Nucleic acids are built from nucleotide monomers, which consist of a phosphate group (circled in green), a sugar (circled in orange), and a base (circled in purple). Nucleotides are polar. </p>
<img src='/assets/courseware/v1/0cac68a909c824eebb269d3d2d1b5e63/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/d4.png' alt="This image is of guanosine monophosphate: C1=NC2=C(N1C3C(C(C(O3)COP(=O)(O)O)O)O)N=C(NC2=O)N">
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<h2 class="hd hd-2 unit-title">Exercise 1 (Macromolecule identification)</h2>
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<p>The following questions center around Molecules 1-4, shown here.</p>
<img src='/assets/courseware/v1/8bd6e315efd999be7f5f45d71375ce42/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/d5_NEW.png' alt="This image is of four molecules labelled 1 through 4. Molecule 1 is C(C(=O)NCC(=O)O)N. Molecule 2 is CC1=CN(C(=O)NC1=O)C2CC(C(O2)COP(=O)(O)O)O. Molecule 3 is C(C(C(C(C(=O)CO)O)O)O)O. Molecule 4 is C1CCC2C(C1)CCC3C2CCC4C3CC(=O)C4.">
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1= glyclglycine
2= thymidine monophosphate
3= fructose
4= somewhere between estrane CC12CCC3C(C1CCC2=O)CCC4C3CCC(=O)C4 and gonane C1CCC2C(C1)CCC3C2CCC4C3CCC4...?
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<input type="radio" name="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1" id="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="a3bb7b050b1a4d089ae62cf22e84a9dc_2_1-choice_0-label" for="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1"> Molecule 1
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<input type="radio" name="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1" id="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="a3bb7b050b1a4d089ae62cf22e84a9dc_2_1-choice_1-label" for="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1"> Molecule 2
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<input type="radio" name="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1" id="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_3" class="field-input input-radio" value="choice_3"/><label id="a3bb7b050b1a4d089ae62cf22e84a9dc_2_1-choice_3-label" for="input_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1_choice_3" class="response-label field-label label-inline" aria-describedby="status_a3bb7b050b1a4d089ae62cf22e84a9dc_2_1"> Molecule 4
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Question 3
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<p>Which molecule follows the formula (CH<sub>2</sub>O)<sub>n</sub>?<br/>Select the best answer.</p>
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<input type="radio" name="input_46eb1b5e2f6f48a3827e3e14bebd9f44_2_1" id="input_46eb1b5e2f6f48a3827e3e14bebd9f44_2_1_choice_2" class="field-input input-radio" value="choice_2"/><label id="46eb1b5e2f6f48a3827e3e14bebd9f44_2_1-choice_2-label" for="input_46eb1b5e2f6f48a3827e3e14bebd9f44_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_46eb1b5e2f6f48a3827e3e14bebd9f44_2_1"> Molecule 3
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<h2 class="hd hd-2 unit-title">Exercise 2 (Amino Acids)</h2>
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<p> The molecule above is the amino acid <b>cysteine</b> (CYS). <br /> The <b>α-carbon </b>is indicated with the red arrow. <br /> The<b> R-group</b> is circled in blue. <em>(Remember, the R-group is the side chain of the α-C.) </em> </p>
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Alanine: alpha-Carbon
</h3>
<div class="problem-progress" id="block-v1:OCW+Pre-7.01+1T2020+type@problem+block@8197414cf17c4f74bd594564b82cc193-problem-progress"></div>
<div class="problem">
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<p>The molecule below is the amino acid <b>alanine</b> (ALA). </p>
<p>Click on the image below to place the circle over alanine's &#945;-carbon. </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="imageinput capa_inputtype" id="inputtype_8197414cf17c4f74bd594564b82cc193_2_1">
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Alanine: R-group
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<p>Click on the image below to place the circle over alanine's R-group. </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="imageinput capa_inputtype" id="inputtype_5cb33157bad042ce9b089f0f771eb6dd_2_1">
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Tyrosine: alpha-Carbon
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<div class="problem-progress" id="block-v1:OCW+Pre-7.01+1T2020+type@problem+block@39464f585d9748c6b9340d7408c7e10e-problem-progress"></div>
<div class="problem">
<div>
<p>The molecule below is the amino acid <b> tyrosine</b> (TYR). </p>
<p>Click on the image below to place the circle over tyrosine's &#945;-carbon. </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="imageinput capa_inputtype" id="inputtype_39464f585d9748c6b9340d7408c7e10e_2_1">
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Tyrosine: R-group
</h3>
<div class="problem-progress" id="block-v1:OCW+Pre-7.01+1T2020+type@problem+block@11499d81b1724c63990b4d55e9266622-problem-progress"></div>
<div class="problem">
<div>
<p>The molecule below is the amino acid <b> tyrosine</b> (TYR). </p>
<p>Click on the image below to place the circle over tyrosine's R-group. </p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="imageinput capa_inputtype" id="inputtype_11499d81b1724c63990b4d55e9266622_2_1">
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<input type="hidden" name="problem_id" value="Tyrosine: R-group" />
<div class="submit-attempt-container">
<button type="button" class="submit btn-brand" data-submitting="Submitting" data-value="Submit" data-should-enable-submit-button="True" aria-describedby="submission_feedback_11499d81b1724c63990b4d55e9266622" >
<span class="submit-label">Submit</span>
</button>
<div class="submission-feedback" id="submission_feedback_11499d81b1724c63990b4d55e9266622">
<span class="sr">Some problems have options such as save, reset, hints, or show answer. These options follow the Submit button.</span>
</div>
</div>
<div class="problem-action-buttons-wrapper">
<span class="problem-action-button-wrapper">
<button type="button" class="reset problem-action-btn btn-default btn-small" data-value="Reset"><span class="icon fa fa-refresh" aria-hidden="true"></span><span aria-hidden="true">Reset</span><span class="sr">Reset your answer</span></button>
</span>
</div>
</div>
<div class="notification warning notification-gentle-alert
is-hidden"
tabindex="-1">
<span class="icon fa fa-exclamation-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="11499d81b1724c63990b4d55e9266622-problem-title">
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification warning notification-save
is-hidden"
tabindex="-1">
<span class="icon fa fa-save" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="11499d81b1724c63990b4d55e9266622-problem-title">None
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
<div class="notification general notification-show-answer
is-hidden"
tabindex="-1">
<span class="icon fa fa-info-circle" aria-hidden="true"></span>
<span class="notification-message" aria-describedby="11499d81b1724c63990b4d55e9266622-problem-title">Answers are displayed within the problem
</span>
<div class="notification-btn-wrapper">
<button type="button" class="btn btn-default btn-small notification-btn review-btn sr">Review</button>
</div>
</div>
</div>
"
data-graded="False">
<p class="loading-spinner">
<i class="fa fa-spinner fa-pulse fa-2x fa-fw"></i>
<span class="sr">Loading…</span>
</p>
</div>
</div>
</div>
</div>
</div>