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I. Component of chlorophyll II. Helps ...

I. Component of chlorophyll
II. Helps to maintain ribosome structure
III. Activator for Rubisco and Pepco
IV. Activates the enzymes of respiration and photosynthesis
V. Involved in synthesis of nucleic acids
The above roles are played by -

A

`Ca^(+2)`

B

`Mg^(+2)`

C

`Mn^(+2)`

D

`Cl^(-)`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the roles played by a specific element, we will analyze each point provided and identify the element that fulfills all these roles. ### Step-by-Step Solution: 1. **Identify the Role of Chlorophyll**: - Chlorophyll is essential for photosynthesis and contains magnesium as a central atom in its structure. This means that the component of chlorophyll is magnesium. 2. **Ribosome Structure Maintenance**: - Magnesium ions play a crucial role in stabilizing the structure of ribosomes by holding the large and small subunits together. This indicates that magnesium is involved in maintaining ribosome structure. 3. **Activator for Rubisco and PEPCO**: - Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) and PEPCO (Phosphoenolpyruvate carboxylase) are enzymes involved in the photosynthetic process. Magnesium acts as an activator for these enzymes, confirming its role in this function. 4. **Activation of Enzymes in Respiration and Photosynthesis**: - Magnesium is known to activate several key enzymes involved in both respiration and photosynthesis, such as hexokinase, phosphofructokinase, and pyruvate kinase. This further supports the idea that magnesium is crucial for these metabolic processes. 5. **Involvement in Nucleic Acid Synthesis**: - Magnesium ions are necessary for the synthesis of nucleic acids (DNA and RNA), as they are involved in the enzymatic reactions that facilitate this process. ### Conclusion: Based on the analysis of all five roles, it is clear that the element responsible for all these functions is **magnesium**. Therefore, the correct answer is: **Magnesium (Option 2)** ---
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