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<h2 class="hd hd-2 unit-title">Lecture 2.3</h2>
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<h2 class="hd hd-2 unit-title">Reference Summary</h2>
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<h3><b>Principles of Pathways</h3></b>
<p>Biochemical pathways include activation (positive control), represented by a pointed arrow (→), <br /> and inhibition (negative control), represented by a T-bar arrow.<br />
Feedback serves to regulate product levels within a pathway. </p> <br />
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<h2 class="hd hd-2 unit-title">Exercise 1 (Pathway Principles)</h2>
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<p>The following questions center around the diagram shown below. </p>
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Question 3
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<p> Click on the diagram to place the circle over the step that acts as a positive feedback pathway (it activates). </p>
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Question 4
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<p> Select the correct response from the dropdown menu to complete following statement. </p>
<p> With excess Product E, the amount of Product C will&#8230; </p>
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<h2 class="hd hd-2 unit-title">Exercise 2 (Interpreting Pathways)</h2>
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<p>The following questions center around the diagram below. </p>
<p>The steps in Pathways 1 and 2 are catalyzed by enzymes (E1, E2, E3, E4). Each enzyme is shown next to the arrow that the enzyme controls. </p><p> E1 is activated by Signal XX. <br /> E4 is activated by Signal YY. </p>
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Question 1
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<p> If XX is absent and YY is present, will Pathway 2 proceed? Select the best answer.</p>
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Question 2
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<p> If the enzyme E4 is absent, will Pathway 2 proceed? Select the best answer.</p>
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Question 3
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<p> Select the correct response from the dropdown menu to fill in the blank of the following statement. </p>
<p>E3 _______ levels of Product D. </p>
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