Cell Structure and Organelles MCQs Quiz 4 Posted on April 2, 2026April 5, 2026Author agropublishers 0 Cell Structure and Organelles MCQs Quiz 4 Cell Biology Multiple Choice Questions 1. RuBisCO catalyzes the process of ____________ Protein folding DNA replication ATP synthesis CO₂ fixation 2. Centrosome duplication in the cell cycle occurs during _____________ G1 phase S phase M phase G2 phase 3. Lysosomal enzymes function optimally at __________ Acidic pH pH independent Alkaline pH Neutral pH 4. The Calvin cycle (carbon fixation pathway) occurs in the ___________ Cytosol Mitochondrial matrix Thylakoid lumen Stroma of chloroplasts 5. Heterochromatin is typically ___________ Transcriptionally inactive and highly condensed RNA-based Active storage proteins ATP-based 6. Peroxisomes are characterized by the presence of ___________ DNA polymerase ATP synthase Ribosomes Catalase and other oxidative enzymes 7. Mannose-6-phosphate (M6P) serves as a signal for targeting proteins to the __________ Nucleus Mitochondria Lysosome Endoplasmic reticulum 8. Nuclear pores primarily regulate _____________ Selective transport ATP synthesis DNA replication Protein folding 9. C₄ plants reduce photorespiratory losses primarily by ___________ Increasing DNA replication Enhancing ATP synthesis Reducing protein folding Minimizing photorespiration 10. Cytokinesis in eukaryotic cells is primarily driven by ____________ Tubulin microtubules RNA synthesis Actin filaments forming a contractile ring DNA condensation Loading … Question 1 of 10 Cell Structure and Organelles MCQs Quiz 4 Cell Biology Multiple Choice Questions
