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