Question 4: Photosynthesis Mechanism (19 points)

a) Describe the two types of reactions that occur in the chloroplast in terms of their response to light. Describe where they take place in the chloroplast. Explain what each reaction accomplishes and how each contributes to the overall process of photosynthesis. (10 points)

b) Describe the features of the two differing locations in the chloroplast where the distinct reactions of photosynthesis occur. Explain the functional significance of these structural features to each of these processes. (4 points)

c) Explain the importance of water to the photosynthetic process. (1 point)

d) A scientist treated a plant with water containing the isotope (H ₂ ¹⁸ O). Describe where the radioisotope oxygen-18 could be found at the end of the treatment period. Construct? a graph to show how the amount of this labeled substance would change over a 24-hour period. (4 points)

outer membrane inner membrane thylakoid inter- membrane space Chloroplast granum D 0000 stroma thylakoid space