Cell Structure and Organelles MCQs Quiz 29 Posted on April 6, 2026Author agropublishers 0 1. In the phospholipid bilayer of the plasma membrane, the hydrophilic (polar) heads are oriented ___________ Away from any aqueous environment, facing only each other Toward the aqueous environments on both the extracellular and cytoplasmic sides Toward the hydrophobic fatty-acid tails in the membrane interior Randomly, with no consistent orientation 2. The final electron acceptor in aerobic respiration, essential for ATP production, is _______ Carbon dioxide Oxygen NAD⁺ Glucose 3. The cytosol primarily consists of _______ Water, ions, and macromolecules Proteins only Lipids only DNA and RNA only 4. Transcription is the biological process of _______ from a DNA template DNA duplication Protein synthesis RNA synthesis ATP production 5. The cytoplasm in prokaryotes primarily consists of _______. Membrane stacks Nuclear matrix Organelles Cytosol with suspended components 6. Which statement best describes the role of NADH in cellular ATP production? NADH inhibits ATP synthase to regulate its activity NADH stores the high-energy phosphate bonds of ATP NADH donates electrons to Complex I of the electron transport chain NADH directly phosphorylates ADP to make ATP 7. Catalase is a highly efficient antioxidant enzyme found in nearly all aerobic organisms, it detoxifies hydrogen peroxide (H₂O₂) by converting it into _______ Water and Carbon dioxide Carbon dioxide and water Water and oxygen Oxygen and carbon monoxide 8. The cytoplasm of prokaryotes includes _______. Cytosol and suspended molecules Ribosomes DNA Enzymes 9. The DNA of most prokaryotes is typically _______ Linear and single Circular and single Fragmented Linear and multiple 10. Which organelle is generally absent in prokaryotic cells _______ Cytoplasm Nucleus Cell membrane Ribosome Loading … Question 1 of 10
