`RuBisCO` content of chloroplast is

Options

A. `20 %`
B. `5 %`
C. `11 %`
D. `16 %`.

Answer

To determine the RuBisCO content of chloroplasts, follow these steps:

1. **Understand RuBisCO**: RuBisCO, or ribulose-1,5-bisphosphate carboxylase/oxygenase, is an enzyme crucial for the process of photosynthesis. It catalyzes the first major step of carbon fixation in the Calvin cycle.

2. **Location of RuBisCO**: RuBisCO is located in the stroma of chloroplasts. The stroma is the fluid-filled space surrounding the thylakoids in chloroplasts, where various metabolic processes occur.

3. **Concentration of RuBisCO**: The concentration of RuBisCO in chloroplasts can vary, but it is known to make up a significant portion of the total protein content within chloroplasts. Estimates suggest that RuBisCO can account for anywhere between 15% to 50% of the total chloroplast protein.

4. **Analyzing the Options**: The options provided are 20%, 5%, 11%, and 16%. Given the information that RuBisCO can constitute a significant percentage of chloroplast protein, we need to identify the most accurate option.

5. **Selecting the Correct Answer**: Based on the information discussed, the RuBisCO content of chloroplasts is approximately 16%. This aligns with the known data about the concentration of RuBisCO in chloroplasts.

6. **Conclusion**: Therefore, the correct answer to the question regarding the RuBisCO content of chloroplasts is **16%**.