Choose the correct substrate - enzyme pair

Options

A. Casein - Rennin
B. Protein - Amylase
C. Carbohydrate - lipase
D. Lactose - Maltase

Answer

To choose the correct substrate-enzyme pair, we need to identify the enzyme and its corresponding substrate based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Identify the Enzyme**:
- The enzyme mentioned in the transcript is **renin**.

2. **Identify the Substrate**:
- The transcript states that renin acts on **casein**, which is a milk protein.

3. **Understand the Function**:
- Renin is secreted by the gastric glands and functions to break down casein in milk. It is important to note that renin is also referred to as **trorenin** in its active form.

4. **Formulate the Pair**:
- Based on the information, the correct substrate-enzyme pair is:
- **Enzyme**: Renin
- **Substrate**: Casein

### Final Answer:
The correct substrate-enzyme pair is **Renin (enzyme) - Casein (substrate)**.

---