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