Articles > Quizzes & Surveys > Cell Structure – Quiz Cell Structure – Quiz Quiz Choose the best answer. 1. The site where mRNA is synthesized Endoplasmic reticulum Cytoplasm Ribosome Nucleus 2. Contains extranuclear DNA Nucleus Nucleolus Mitochondrion Ribosomes 3. Where ribosomes are attached to Nuclear envelope Cytoplasm Golgi apparatus Endoplasmic reticulum 4. Contains digestive enzymes Lysosome Endosome Peroxisome Endoplasmic reticulum 5. A type of cytoskeleton composed of tubulin proteins Microfilament Intermediate filament Microtubule None of the above Send Your Results (Optional) Your Name To Email Time is Up!