Cell Structure and Organelles MCQs Quiz 25 Posted on April 6, 2026Author agropublishers 0 1. Reactive oxygen species (ROS) include which of the following? DNA and RNA Lipids and proteins Glucose and ATP Superoxide anion (O₂•⁻) and hydrogen peroxide (H₂O₂) 2. ATP synthase generates ATP using energy derived from _______ Light reactions Substrate-level phosphorylation Electrochemical proton gradient Direct glucose breakdown 3. Which component most directly regulates the fluidity of the plasma membrane? Cytoskeletal actin filaments beneath the membrane Ribosomal RNA in the cytoplasm Cholesterol DNA in the nucleus 4. Cancer is fundamentally characterized by _______. Controlled cell division Reduced metabolism Unregulated cell proliferation Enhanced apoptosis 5. The size of prokaryotic cells typically ranges from________ to _________ diameter 100 to 500 µm 0.1 to 5 µm 10 to 50 µm 10 to100 µm 6. A chromosomal inversion involves _______ DNA replication Protein folding DNA loss Reversal of segment 7. Genes that promote cell division when activated are called _______. Structural genes Housekeeping genes Tumor suppressor genes Oncogenes 8. DNA in eukaryotic cells is typically _______ Linear and associated with histones Absent Single-stranded Circular and naked 9. The basic structure of the plasma membrane is a _______ Nucleic acid matrix Phospholipid bilayer Protein monolayer Carbohydrate bilayer 10. Glycosylation of proteins primarily begins in _______ Nucleus Peroxisome Rough Endoplasmic Reticulum lumen Cytosol Loading … Question 1 of 10
