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