Cyanide kills animlas by inhibiting cytochrome oxidase (an enzyme of respiration) by binding irreversibly with copper. It does not bind with active site. This is an example of

Options

A. competitive inhinition
B. non competitive inhibition
C. feed back inhibition
D. all of the above

Answer

To solve the question regarding how cyanide kills animals by inhibiting cytochrome oxidase, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Role of Cytochrome Oxidase**:
- Cytochrome oxidase is an enzyme involved in the electron transport chain during cellular respiration. It plays a crucial role in the process of ATP production by facilitating the transfer of electrons to oxygen.

**Hint**: Recall the function of cytochrome oxidase in cellular respiration.

2. **Mechanism of Cyanide Action**:
- Cyanide binds irreversibly to copper ions present in the cytochrome oxidase enzyme. This binding prevents the enzyme from functioning properly, thus inhibiting respiration.

**Hint**: Consider how the binding of a molecule can affect enzyme activity.

3. **Type of Inhibition**:
- The key detail in the question is that cyanide does not bind to the active site of the enzyme. Instead, it binds to a different site (the copper), which leads to a loss of enzyme function. This is indicative of non-competitive inhibition, where the inhibitor can bind to the enzyme regardless of whether the substrate is present.

**Hint**: Differentiate between competitive and non-competitive inhibition based on where the inhibitor binds.

4. **Conclusion**:
- Since cyanide inhibits cytochrome oxidase by binding irreversibly to copper and not to the active site, this is classified as **non-competitive inhibition**.

**Hint**: Remember that non-competitive inhibitors can bind to the enzyme regardless of substrate presence, affecting the overall enzyme activity.

### Final Answer:
Cyanide kills animals by inhibiting cytochrome oxidase through non-competitive inhibition.