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