If FADH2 provides reducing equivalents to electron transpo chain then ATP formed will be ?
**Core Concept**
The electron transport chain (ETC) is a critical process in cellular respiration where energy is generated in the form of ATP. FADH2 (Flavin adenine dinucleotide, reduced form) is a coenzyme that donates reducing equivalents to the ETC, contributing to the production of ATP.
**Why the Correct Answer is Right**
FADH2 donates its reducing equivalents to the ETC at the level of Complex II (Succinate dehydrogenase), bypassing the first two complexes (NADH dehydrogenase and succinate dehydrogenase). This means that FADH2 bypasses the proton pump in Complex I, resulting in a lower energy yield compared to NADH. Consequently, FADH2 generates approximately 1.5 ATP molecules per FADH2 molecule, whereas NADH generates approximately 2.5 ATP molecules per NADH molecule.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately reflect the energy yield of FADH2 in the ETC.
**Option B:** This option is incorrect because it overestimates the energy yield of FADH2.
**Option C:** This option is incorrect because it underestimates the energy yield of FADH2.
**Option D:** This option is incorrect because it is a vague and incomplete answer.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the energy yield of NADH and FADH2 in the ETC is approximately 2.5 and 1.5 ATP molecules, respectively. This knowledge can help you understand the overall efficiency of cellular respiration and the significance of FADH2 in energy production.
**Correct Answer:** C. 1.5