Cell Structure and Organelles MCQs Quiz 29 Posted on April 6, 2026Author agropublishers 0 1. 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 2. The cytoplasm of prokaryotes includes _______. DNA Ribosomes Cytosol and suspended molecules Enzymes 3. Transcription is the biological process of _______ from a DNA template Protein synthesis DNA duplication RNA synthesis ATP production 4. 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 5. The cytoplasm in prokaryotes primarily consists of _______. Membrane stacks Cytosol with suspended components Organelles Nuclear matrix 6. Which organelle is generally absent in prokaryotic cells _______ Cell membrane Nucleus Ribosome Cytoplasm 7. The cytosol primarily consists of _______ Water, ions, and macromolecules DNA and RNA only Lipids only Proteins only 8. The DNA of most prokaryotes is typically _______ Linear and single Circular and single Fragmented Linear and multiple 9. The final electron acceptor in aerobic respiration, essential for ATP production, is _______ Oxygen NAD⁺ Glucose Carbon dioxide 10. Which statement best describes the role of NADH in cellular ATP production? NADH directly phosphorylates ADP to make ATP NADH stores the high-energy phosphate bonds of ATP NADH inhibits ATP synthase to regulate its activity NADH donates electrons to Complex I of the electron transport chain Loading … Question 1 of 10
