Exotoxins are –
**Core Concept**
Exotoxins are toxic substances produced by certain bacteria, including **Corynebacterium diphtheriae** and **Clostridium tetani**. These toxins are secreted by the bacteria into the surrounding medium. Exotoxins can cause various diseases, including diphtheria and tetanus.
**Why the Correct Answer is Right**
The correct answer choice is not provided, however, exotoxins are typically proteins that are highly toxic and can be neutralized by **antitoxins**. They work by targeting specific cellular mechanisms, such as protein synthesis or neurotransmission. For example, the exotoxin produced by **Corynebacterium diphtheriae** inhibits protein synthesis by inactivating the **elongation factor**.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific answer choices, it's difficult to provide detailed explanations for each incorrect option.
**Option B:**
**Option C:**
**Option D:**
**Clinical Pearl / High-Yield Fact**
It's essential to remember that exotoxins are often associated with specific diseases, such as botulism and tetanus, and can be treated with **antitoxins**.
**Correct Answer:** Not provided in the question.