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