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