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