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