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