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 IV (Cytochrome c oxidase) Complex III (Cytochrome bc₁ complex) Complex II (Succinate dehydrogenase) Complex I (NADH:ubiquinone oxidoreductase) 2. Which domain(s) include prokaryotic organisms? All of these Bacteria and Archaea Eukarya only Fungi and Plantae 3. The hydrophobic tails of phospholipids in plasma memberane, are oriented _______ Facing water Facing outward Toward the interior of the bilayer Toward the nucleus 4. The internal organization of a prokaryotic cell is best described as _______ Non-compartmentalized Organelle-rich Highly compartmentalized Membrane-segregated 5. Which of the following is present in both prokaryotic and eukaryotic cells? Mitochondria Ribosomes Nucleus Chloroplast 6. ____________ enzyme is responsible for decomposition of hydrogen peroxide in peroxisomes Oxidase Hydrolase Catalase Peroxidase 7. The primary structural unit of chromatin is the _______ Nucleosome Gene Ribosome Chromosome 8. Microvilli increase the cell’s ____________ Total cytosolic volume Plasma membrane thickness Rate of nuclear DNA replication Surface area for absorption 9. Chlorophyll is localized in _______ Cristae Outer membrane of chloroplast Thylakoid membranes Stroma 10. Ribosomes found in the cytoplasm of eukaryotic cells a sedimentation coefficient of _______ 70S (composed of 50S + 30S subunits) 55S (mitochondrial ribosomes) 80S (composed of 60S + 40S subunits) 100S (dimerized prokaryotic ribosomes) Loading … Question 1 of 10
