Which of the following is synthesized by free-floating ribosomes in the cytoplasm of humans?
Correct answer: D. DNA helicase
- A. DNA polymerase
- B. Salivary amylase
- C. Pancreatic amylase
- D. DNA helicase
Explanation
The correct answer is DNA helicase since it is the only one whose final destination is inside the cell. All other proteins are secreted (lipase and amylase are digestive enzymes, and insulin is a hormone found in the blood) and therefore need to enter the exocytic pathway (exocytosis).
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About Cytoplasmic Organelles
Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.
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