1. Which enzyme is responsible for the unzipping of the DNA double helix during replication?
2. What is the primary function of xylem in vascular plants?
3. What is the role of the stomata in plants?
4. Which of the following diseases is caused by a deficiency of vitamin C?
5. What is the powerhouse of the cell?
6. In which part of the plant does photosynthesis primarily occur?
7. Which of the following is not a function of the smooth endoplasmic reticulum?
8. Which hormone is primarily responsible for regulating the sleep-wake cycle in humans?
9. Which part of the brain is responsible for regulating heart rate and breathing?
10. Which of the following is a characteristic feature of dicotyledonous plants?
11. Which of the following is the basic unit of life?
12. Which biomolecule is the main component of cell membranes?
