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