An enzyme is kept at -`10^@C` for 3 minutes and is used in a chemical reaction (P). It is then gradually brought to room temperature. It is now used in a chemical reaction (Q). Another enzyme is kept at `80^@C` For 5 minutes and is used in chemical reaction (R). It is then gradually brought to room temperature. It is now used in a chemical reaction (S). Which of these reactions will be catalyzed by enzyme and which will not?

Options

A. Reactions in which products are formed : P and R. Reactions is which products are not formed Q and S
B. Reactions in which products are formed : Q and S. Reactions is which products are not formed P and R
C. Reactions in which products are formed : P, R and S . Reactions in which products are not formed Q only
D. Reactions in which products are formed : Only Q . Reactions in which products in which products are not formed : P , R and S

Answer

To solve the question regarding the enzymatic reactions, we need to analyze the conditions under which each enzyme is kept and how these conditions affect their activity. Here’s a step-by-step breakdown:

### Step 1: Analyze Enzyme A (kept at -10°C)
- **Condition**: Enzyme A is kept at -10°C for 3 minutes.
- **Effect**: At such low temperatures, enzymes generally show negligible activity but do not denature. Therefore, they remain intact but inactive.
- **Reaction P**: When used in reaction P immediately after being kept at -10°C, the enzyme will not catalyze the reaction because it is inactive at that temperature.
- **Conclusion**: No product will be formed in reaction P.

### Step 2: Gradual warming of Enzyme A
- **Condition**: Enzyme A is then gradually brought to room temperature.
- **Effect**: Once at room temperature, the enzyme regains its activity.
- **Reaction Q**: When used in reaction Q after warming, the enzyme will be active and can catalyze the reaction.
- **Conclusion**: Product will be formed in reaction Q.

### Step 3: Analyze Enzyme B (kept at 80°C)
- **Condition**: Enzyme B is kept at 80°C for 5 minutes.
- **Effect**: High temperatures (above the optimal range for most enzymes) typically lead to denaturation, which means the enzyme's structure is altered and it loses its functionality.
- **Reaction R**: When used in reaction R immediately after being kept at 80°C, the enzyme will not catalyze the reaction due to denaturation.
- **Conclusion**: No product will be formed in reaction R.

### Step 4: Gradual warming of Enzyme B
- **Condition**: Enzyme B is then gradually brought to room temperature.
- **Effect**: Since the enzyme was denatured at 80°C, it cannot regain its functional structure even after being cooled down.
- **Reaction S**: When used in reaction S after cooling, the enzyme remains inactive.
- **Conclusion**: No product will be formed in reaction S.

### Final Summary
- **Reactions with products**:
- Reaction Q (Enzyme A after warming)
- **Reactions without products**:
- Reaction P (Enzyme A at -10°C)
- Reaction R (Enzyme B at 80°C)
- Reaction S (Enzyme B after cooling)

### Answer
- **Products formed**: Q
- **No products formed**: P, R, S