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<p> <strong>Welcome back to AllCBTs!</strong><br>Today, we’ll explore some <strong>General Biology past questions</strong> from GA (General Aptitude), focusing on <strong>cell structure, genetics, and molecular biology</strong>. This guide is ideal for students preparing for major exams such as <strong>JUPEB</strong>, <strong>WAEC</strong>, <strong>NECO</strong>, <strong>GCE</strong>, or even <strong>JAMB</strong>.</p>
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<p>Let’s dive right into it!</p>
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<p>You can watch the full class in the video below:</p>
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<h2 class="wp-block-heading" id="h-question-1-organelle-responsible-for-energy-production">Question 1: Organelle Responsible for Energy Production</h2>
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<p><strong>Which organelle is responsible for energy production in animal cells?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Ribosome</li>
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<li>B. Mitochondrion</li>
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<li>C. Lysosome</li>
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<li>D. Golgi body</li>
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<p><strong>Correct Answer: B. Mitochondrion</strong></p>
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<p><strong>Explanation:</strong><br>The mitochondrion is often referred to as the <strong>"powerhouse of the cell"</strong> because it generates <strong>ATP</strong>, the cell’s energy currency.</p>
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<h2 class="wp-block-heading" id="h-question-2-phase-of-dna-replication">Question 2: Phase of DNA Replication</h2>
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<p><strong>DNA replication occurs in which phase of the cell cycle?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. G1 Phase</li>
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<li>B. S Phase</li>
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<li>C. G2 Phase</li>
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<li>D. M Phase</li>
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<p><strong>Correct Answer: B. S Phase</strong></p>
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<p><strong>Explanation:</strong><br>During the <strong>Synthesis (S) Phase</strong>, DNA is replicated in preparation for cell division.</p>
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<h2 class="wp-block-heading" id="h-question-3-organelle-that-synthesizes-proteins">Question 3: Organelle That Synthesizes Proteins</h2>
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<p><strong>Which structure synthesizes proteins?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Ribosome</li>
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<li>B. Nucleus</li>
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<li>C. Lysosome</li>
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<li>D. Vacuole</li>
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<p><strong>Correct Answer: A. Ribosome</strong></p>
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<p><strong>Explanation:</strong><br>Ribosomes are the sites of <strong>protein synthesis</strong> in cells. They translate genetic information into proteins.</p>
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<h2 class="wp-block-heading" id="h-question-4-difference-between-prokaryotic-and-eukaryotic-cells">Question 4: Difference Between Prokaryotic and Eukaryotic Cells</h2>
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<p><strong>Main difference between prokaryotic and eukaryotic cells?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Shape</li>
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<li>B. Size</li>
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<li>C. Presence of nucleus</li>
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<li>D. DNA content</li>
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<p><strong>Correct Answer: C. Presence of nucleus</strong></p>
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<p><strong>Explanation:</strong><br>Prokaryotic cells <strong>lack a true nucleus</strong>, while eukaryotic cells <strong>have a membrane-bound nucleus</strong>.</p>
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<h2 class="wp-block-heading" id="h-question-5-atp-production-site">Question 5: ATP Production Site</h2>
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<p><strong>ATP is produced during which cellular process?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Photosynthesis</li>
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<li>B. Glycolysis</li>
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<li>C. Krebs Cycle</li>
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<li>D. Electron Transport Chain</li>
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<p><strong>Correct Answer: D. Electron Transport Chain</strong></p>
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<p><strong>Explanation:</strong><br>ATP is primarily produced during the <strong>electron transport chain</strong>, the final stage of aerobic respiration.</p>
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<h2 class="wp-block-heading" id="h-question-6-probability-of-recessive-disorder-inheritance">Question 6: Probability of Recessive Disorder Inheritance</h2>
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<p><strong>What is the probability that a child inherits a recessive disorder if both parents are carriers?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. 0%</li>
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<li>B. 25%</li>
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<li>C. 50%</li>
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<li>D. 100%</li>
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<p> <strong>Correct Answer: B. 25%</strong></p>
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<p><strong>Explanation:</strong><br>If both parents are <strong>heterozygous (carriers)</strong>, the Mendelian Punnett square reveals a <strong>25% chance</strong> of the offspring inheriting the recessive trait.</p>
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<h2 class="wp-block-heading" id="h-question-7-rna-base-identification">Question 7: RNA Base Identification</h2>
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<p><strong>Which base is NOT found in RNA?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Adenine</li>
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<li>B. Thymine</li>
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<li>C. Uracil</li>
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<li>D. Cytosine</li>
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<p><strong>Correct Answer: B. Thymine</strong></p>
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<p><strong>Explanation:</strong><br><strong>Thymine</strong> is found in DNA. In RNA, it's replaced by <strong>Uracil (U).</strong></p>
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<h2 class="wp-block-heading" id="h-question-8-phenotypic-ratio-of-dihybrid-cross">Question 8: Phenotypic Ratio of Dihybrid Cross</h2>
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<p><strong>What is the phenotypic ratio in a typical dihybrid cross (AaBb x AaBb)?</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. 1:1</li>
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<li>B. 3:1</li>
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<li>C. 9:3:3:1</li>
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<li>D. 1:2:1</li>
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<p><strong>Correct Answer: C. 9:3:3:1</strong></p>
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<p><strong>Explanation:</strong><br>A dihybrid cross between heterozygous parents gives a phenotypic ratio of <strong>9:3:3:1</strong> for two traits.</p>
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<h2 class="wp-block-heading" id="h-question-9-determinant-of-child-s-sex">Question 9: Determinant of Child’s Sex</h2>
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<p><strong>The sex of a child is determined by:</strong></p>
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<p><strong>Options:</strong></p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li>A. Egg cell</li>
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<li>B. Sperm cell</li>
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<li>C. Both cells</li>
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<li>D. Hormones</li>
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<p><strong>Correct Answer: B. Sperm cell</strong></p>
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<p><strong>Explanation:</strong><br><strong>Sperm cells</strong> can carry either an X or a Y chromosome, determining if the child is <strong>male (XY)</strong> or <strong>female (XX)</strong>.</p>
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<h2 class="wp-block-heading" id="h-question-10-genetic-message-carriers">Question 10: Genetic Message Carriers</h2>
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<p><strong>Which molecule carries genetic instructions from DNA to the ribosome?</strong></p>
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<p> <strong>Correct Answer: mRNA (messenger RNA)</strong></p>
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<p><strong>Explanation:</strong><br><strong>mRNA</strong> transcribes information from DNA and carries it to the <strong>ribosome</strong> for translation into proteins.</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-final-thoughts">Final Thoughts</h2>
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<p>These 10 questions cover essential topics like:</p>
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<ul class="wp-block-list"><!-- wp:list-item -->
<li><strong>Cell biology</strong></li>
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<li><strong>Genetics</strong></li>
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<li><strong>Molecular biology</strong></li>
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<li><strong>Inheritance</strong></li>
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<p>Mastering them gives you a major edge in your <strong>JUPEB, WAEC, NECO</strong>, and <strong>JAMB Biology exams</strong>.</p>
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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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<h2 class="wp-block-heading" id="h-keywords"> Keywords</h2>
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<p><strong>#Biology2025, #JUPEBBiology, #AllCBTs, #WAECBiology, #NECOBiology, #CellBiology, #GeneticsExplained, #BiologyPastQuestions, #ExamSuccessTips, #SpermDeterminesSex, #RibosomeFunction, #mRNAFunction</strong></p>
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