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<h2 class="hd hd-2 unit-title">Reference Summary</h2>
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<h3><b> Anabolism v. Catabolism </b></h3>
<p><b> Anabolism</b> is a form of metabolism that consumes energy and by which covalent bonds are formed. <br />
<b> Catabolism </b> is a form of metabolism that produces energy and by which covalent bonds are broken. </p>
<br />
<h3><b> Condensation Reactions </b></h3>
<p>A condensation reaction is one that forms covalent bonds and produces water as a product. These reactions are anabolic.</p>
<p><b> A-OH + H-B → A-B + H<sub>2</sub>O</b>
<br/><i> (This reaction is also included in the figure at end.) </i></p>
<br />
<h3><b> Hydrolysis Reactions </b></h3>
<p> Hydrolysis reactions break covalent bonds by consuming a water molecule and dividing its atoms between separate molecules. These reactions are catabolic.</p>
<p><b> A-B + H<sub>2</sub>O → A-OH + H-B</b>
<br/><i> (This reaction is also included in the figure below.) </i></p>
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<h2 class="hd hd-2 unit-title">Exercise 1 (Gly-Ala Dipeptide)</h2>
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<p> The following questions concern the formation of the <b>Gly-Ala dipeptide</b>, which is depicted below. </p>
<img src='/assets/courseware/v1/b053907124f5ef0a0f855773e541478b/asset-v1:OCW+Pre-7.01+1T2020+type@asset+block/h1.png' alt="This image is of a glycine molecule C(C(=O)O)N and an alanine molecule CC(C(=O)O)N that react to form a Gly-Ala dipeptide molecule CC(C(=O)O)NC(=O)CN. Gly-Ala is also known as glycl-L-alanine. An arrow describing the reaction of glycine and alanine to form the dipeptide is labelled as Reaction 1. A second arrow describing the reverse reaction, that is the dipeptide forming glycine and alanine, is labelled as Reaction 2. " >
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<h2 class="hd hd-2 unit-title">Exercise 2 (Glucose Pathways)</h2>
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Question 1
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<p>Which of the reactions above (labeled in red) use hydrolysis (are catabolic)? <br/>Check all that apply.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_5eab63f70de146588fec23121fd85c07_2_1">
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<input type="checkbox" name="input_5eab63f70de146588fec23121fd85c07_2_1[]" id="input_5eab63f70de146588fec23121fd85c07_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="5eab63f70de146588fec23121fd85c07_2_1-choice_0-label" for="input_5eab63f70de146588fec23121fd85c07_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_5eab63f70de146588fec23121fd85c07_2_1"> reaction 1
</label>
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<input type="checkbox" name="input_5eab63f70de146588fec23121fd85c07_2_1[]" id="input_5eab63f70de146588fec23121fd85c07_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="5eab63f70de146588fec23121fd85c07_2_1-choice_1-label" for="input_5eab63f70de146588fec23121fd85c07_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_5eab63f70de146588fec23121fd85c07_2_1"> reaction 2
</label>
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<input type="checkbox" name="input_5eab63f70de146588fec23121fd85c07_2_1[]" id="input_5eab63f70de146588fec23121fd85c07_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="5eab63f70de146588fec23121fd85c07_2_1-choice_2-label" for="input_5eab63f70de146588fec23121fd85c07_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_5eab63f70de146588fec23121fd85c07_2_1"> reaction 3
</label>
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<span id="answer_5eab63f70de146588fec23121fd85c07_2_1"/>
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<p>Note: Make sure you select <i>all</i> of the correct options!</p>
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Question 2
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<p>Which of the reactions above (labeled in red) are anabolic? <br/>Check all that apply.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_41c7e05101324e34aae0acd7204ad14d_2_1">
<fieldset aria-describedby="status_41c7e05101324e34aae0acd7204ad14d_2_1">
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<input type="checkbox" name="input_41c7e05101324e34aae0acd7204ad14d_2_1[]" id="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_0" class="field-input input-checkbox" value="choice_0"/><label id="41c7e05101324e34aae0acd7204ad14d_2_1-choice_0-label" for="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_41c7e05101324e34aae0acd7204ad14d_2_1"> reaction 1
</label>
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<input type="checkbox" name="input_41c7e05101324e34aae0acd7204ad14d_2_1[]" id="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_1" class="field-input input-checkbox" value="choice_1"/><label id="41c7e05101324e34aae0acd7204ad14d_2_1-choice_1-label" for="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_41c7e05101324e34aae0acd7204ad14d_2_1"> reaction 2
</label>
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<input type="checkbox" name="input_41c7e05101324e34aae0acd7204ad14d_2_1[]" id="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_2" class="field-input input-checkbox" value="choice_2"/><label id="41c7e05101324e34aae0acd7204ad14d_2_1-choice_2-label" for="input_41c7e05101324e34aae0acd7204ad14d_2_1_choice_2" class="response-label field-label label-inline" aria-describedby="status_41c7e05101324e34aae0acd7204ad14d_2_1"> reaction 3
</label>
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Question 3
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<p>What type of reactions are likely to use energy? Select the best answer.</p>
<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><div class="choicegroup capa_inputtype" id="inputtype_3e17e2386a2d43b88519480f205f68e6_2_1">
<fieldset aria-describedby="status_3e17e2386a2d43b88519480f205f68e6_2_1">
<div class="field">
<input type="radio" name="input_3e17e2386a2d43b88519480f205f68e6_2_1" id="input_3e17e2386a2d43b88519480f205f68e6_2_1_choice_0" class="field-input input-radio" value="choice_0"/><label id="3e17e2386a2d43b88519480f205f68e6_2_1-choice_0-label" for="input_3e17e2386a2d43b88519480f205f68e6_2_1_choice_0" class="response-label field-label label-inline" aria-describedby="status_3e17e2386a2d43b88519480f205f68e6_2_1"> anabolic
</label>
</div>
<div class="field">
<input type="radio" name="input_3e17e2386a2d43b88519480f205f68e6_2_1" id="input_3e17e2386a2d43b88519480f205f68e6_2_1_choice_1" class="field-input input-radio" value="choice_1"/><label id="3e17e2386a2d43b88519480f205f68e6_2_1-choice_1-label" for="input_3e17e2386a2d43b88519480f205f68e6_2_1_choice_1" class="response-label field-label label-inline" aria-describedby="status_3e17e2386a2d43b88519480f205f68e6_2_1"> catabolic
</label>
</div>
<span id="answer_3e17e2386a2d43b88519480f205f68e6_2_1"/>
</fieldset>
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<span class="notification-message" aria-describedby="3e17e2386a2d43b88519480f205f68e6-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>