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<h2 class="wp-block-heading" id="h-introduction">Introduction</h2>
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<p>Good day, everyone!<br>My name is <strong>Ade Banke</strong>, and I’ll be your biology tutor for today’s session. In this tutorial, we’ll be tackling <strong>key senior secondary school biology questions</strong>, focusing on <strong>DNA replication</strong> and <strong>bacterial survival mechanisms</strong>. These topics are commonly featured in WAEC, NECO, and JAMB exams.</p>
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<p>Let’s dive straight into the questions and explain them step by step for deeper understanding.</p>
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<p>You can watch the full class in the video below:</p>
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https://www.youtube.com/watch?v=yGueknK9Azc
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<h2 class="wp-block-heading" id="h-question-1-what-process-allows-prokaryotes-to-survive-harsh-conditions">Question 1: What Process Allows Prokaryotes to Survive Harsh Conditions?</h2>
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<p><strong>Question:</strong><br>Which process allows prokaryotes to survive harsh conditions by forming a tough, protective wall?</p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Budding</li>
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<li>B. Binary fission</li>
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<li>C. Endospore formation</li>
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<li>D. Sporulation</li>
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<h3 class="wp-block-heading" id="h-explanation">Explanation:</h3>
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<p>This question explores the <strong>adaptation of prokaryotes (like bacteria)</strong> to extreme environments such as high heat, dehydration, or nutrient deficiency.</p>
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<li><strong>Option A: Budding</strong> – This is a form of asexual reproduction, not a survival mechanism. </li>
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<li><strong>Option B: Binary fission</strong> – This is how cells divide, not how they survive stress. </li>
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<li><strong>Option C: Endospore formation</strong> – Correct! Endospore formation is a special method bacteria use to encase themselves in a durable structure to resist unfavorable conditions. </li>
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<li><strong>Option D: Sporulation</strong> – This refers more generally to spore formation in <strong>plants and fungi</strong>, not prokaryotes. </li>
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<p><strong>Correct Answer: C. Endospore formation</strong></p>
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<h2 class="wp-block-heading" id="h-question-2-which-enzyme-is-responsible-for-unzipping-dna-strands-during-replication">Question 2: Which Enzyme Is Responsible for Unzipping DNA Strands During Replication?</h2>
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<h3 class="wp-block-heading" id="h-understanding-dna-replication">Understanding DNA Replication:</h3>
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<p>DNA is a <strong>double-stranded helical molecule</strong>, often compared to a twisted ladder. For <strong>DNA replication</strong> to occur, the strands must first <strong>separate or "unzip"</strong> to allow the creation of a complementary copy—just like making a <strong>photocopy</strong> of a textbook.</p>
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<li>A. DNA ligase</li>
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<li>B. DNA helicase</li>
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<li>C. DNA polymerase</li>
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<li>D. RNA primase</li>
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<h3 class="wp-block-heading" id="h-explanation-0">Explanation:</h3>
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<p>Each of these enzymes has a specific role in DNA replication:</p>
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<li><strong>DNA Ligase</strong> acts like <strong>glue</strong>, joining Okazaki fragments on the lagging strand.</li>
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<li><strong>DNA Helicase</strong> is like a <strong>scissors or unzipper</strong>, breaking hydrogen bonds between base pairs to unwind the double helix.</li>
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<li><strong>DNA Polymerase</strong> adds new nucleotides to build the new strand.</li>
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<li><strong>RNA Primase</strong> lays the initial RNA primer for DNA polymerase to start copying.</li>
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<p><strong>Correct Answer: B. DNA helicase</strong></p>
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<h3 class="wp-block-heading" id="h-remember">Remember:</h3>
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<p>Think of <strong>helicase</strong> as a molecular "zip opener" that starts the replication process by unwinding the helix.</p>
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<p><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color"><strong>Watch more educational videos and past questions:</strong> </mark><a href="https://youtube.com/@allcbts">https://youtube.com/@allcbts</a></p>
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<h2 class="wp-block-heading" id="h-conclusion">Conclusion</h2>
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<p>Today’s biology lesson helped clarify:</p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>How bacteria use <strong>endospore formation</strong> as a survival strategy</li>
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<li>The function of <strong>helicase</strong> in DNA replication</li>
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<li>These concepts form the foundation for more advanced biology topics and are frequently asked in exams. Make sure to:</li>
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<li>Understand definitions and functions of biological processes</li>
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<li>Practice related multiple-choice questions</li>
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<li>Use diagrams to visualize processes like replication and cell structure</li>
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<p><strong><mark style="background-color:rgba(0, 0, 0, 0)" class="has-inline-color has-vivid-cyan-blue-color">Related Videos:</mark></strong></p>
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<h3 class="wp-block-heading" id="h-seo-keywords-0">SEO Keywords:</h3>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>DNA replication enzymes</li>
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<li>role of helicase in DNA</li>
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<li>senior secondary school biology questions</li>
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<li>NECO biology tutorial</li>
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<li>WAEC DNA replication MCQs</li>
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<li>enzymes that unzip DNA strands</li>
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