Cell Structure and Organelles MCQs Quiz 27 Posted on April 6, 2026Author agropublishers 0 1. Which complex of the electron transport chain does NOT directly pump protons? Complex III (Cytochrome bc₁ complex) Complex IV (Cytochrome c oxidase) Complex I (NADH:ubiquinone oxidoreductase) Complex II (Succinate dehydrogenase) 2. ____________ enzyme is responsible for decomposition of hydrogen peroxide in peroxisomes Oxidase Hydrolase Catalase Peroxidase 3. Which domain(s) include prokaryotic organisms? Bacteria and Archaea All of these Eukarya only Fungi and Plantae 4. Which of the following is present in both prokaryotic and eukaryotic cells? Chloroplast Mitochondria Nucleus Ribosomes 5. Chlorophyll is localized in _______ Stroma Thylakoid membranes Outer membrane of chloroplast Cristae 6. Microvilli increase the cell’s ____________ Rate of nuclear DNA replication Total cytosolic volume Plasma membrane thickness Surface area for absorption 7. The hydrophobic tails of phospholipids in plasma memberane, are oriented _______ Toward the nucleus Facing water Toward the interior of the bilayer Facing outward 8. The primary structural unit of chromatin is the _______ Chromosome Gene Nucleosome Ribosome 9. Ribosomes found in the cytoplasm of eukaryotic cells a sedimentation coefficient of _______ 80S (composed of 60S + 40S subunits) 100S (dimerized prokaryotic ribosomes) 70S (composed of 50S + 30S subunits) 55S (mitochondrial ribosomes) 10. The internal organization of a prokaryotic cell is best described as _______ Non-compartmentalized Highly compartmentalized Organelle-rich Membrane-segregated Loading … Question 1 of 10
