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