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