In cyanide-resistant respiration, the electrons are passed from ubiquinone to

Options

A. Cyt b
B. Fe-S protein
C. Flavoprotein
D. FMN protein

Answer

To solve the question "In cyanide-resistant respiration, the electrons are passed from ubiquinone to," we can follow these steps:

### Step 1: Understand Cyanide-Resistant Respiration
Cyanide-resistant respiration is a type of respiration that occurs in some plants and involves an alternative pathway in the electron transport chain that does not produce ATP in the same way as traditional respiration.

**Hint:** Remember that cyanide inhibits a specific part of the electron transport chain, which is why this type of respiration is termed "cyanide-resistant."

### Step 2: Identify the Role of Ubiquinone
Ubiquinone, also known as coenzyme Q, is a crucial component of the electron transport chain. It accepts electrons from reduced coenzymes (like NADH and FADH2) and transfers them to other components in the chain.

**Hint:** Think about where ubiquinone fits into the electron transport chain and what it does with the electrons it receives.

### Step 3: Determine the Next Component
In cyanide-resistant respiration, after ubiquinone accepts electrons, it transfers them to a specific protein. The options provided are cytochrome b, FES protein, flavoprotein, or FMN protein.

**Hint:** Recall that in the alternative pathway of the electron transport chain, ubiquinone typically transfers electrons to flavoprotein.

### Step 4: Conclusion
Based on the understanding of the electron transport chain in cyanide-resistant respiration, the correct answer is that the electrons are passed from ubiquinone to **flavoprotein**.

**Final Answer:** Flavoprotein