Enzyme secreted from the acrosome of frog's sperm is

Options

A. Sperm lysin
B. Testosterone
C. Sperm trypsin
D. Sperm gastrin

Answer

To answer the question regarding the enzyme secreted from the acrosome of a frog's sperm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of the Acrosome**:
- The acrosome is a cap-like structure that covers the head of the sperm. It contains enzymes that are crucial for fertilization.

**Hint**: Remember that the acrosome is essential for the sperm's ability to penetrate the egg.

2. **Identify the Process of Fertilization in Frogs**:
- During fertilization, the sperm must penetrate the egg's protective layers, which include the vitelline membrane and the plasma membrane.

**Hint**: Think about what barriers the sperm needs to overcome to fertilize the egg.

3. **Recognize the Type of Enzyme Needed**:
- The process of penetrating the egg involves breaking down these membranes, which requires specific enzymes that can digest proteins.

**Hint**: Consider what kind of enzymes are involved in breaking down proteins.

4. **Determine the Specific Enzyme**:
- The enzyme secreted by the acrosome of frog sperm that facilitates this process is known as **sperm lysine**. This enzyme is a proteolytic enzyme that helps dissolve the vitelline membrane and plasma membrane of the ovum.

**Hint**: Recall that the name of the enzyme relates to its function in lysing or breaking down membranes.

5. **Evaluate the Options Given**:
- The options provided are:
- A) Sperm lysine
- B) Testosterone
- C) Trypsin
- D) Gastrin
- Among these, sperm lysine is the correct answer as it is specifically involved in the fertilization process in frogs.

**Hint**: Eliminate options that do not relate to the fertilization process or are not enzymes.

### Final Answer:
The enzyme secreted from the acrosome of frog sperm is **sperm lysine**.