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