Question

1. Electrons extracted from fatty acids in the peroxisomes are transferred to __________________.

A. NAD+

B. molecular oxygen

C. cytochrome C

D. Quinones

2. Which of the following is a lipid-soluble electron carrier?

A. cytochrome C

B. FAD

C. NAD+

D. ubiquinone

3. Leptin predominantly signals through the:

A. JAK-STATS pathway

B. Metabolite Receptor Pathway

C. Receptor Tyrosine Kinase Pathway

D. GPCR Pathway

Answer 1

Answer to Question No 1 : B) Molecular oxygen

Explanation :

Electrons extracted from fatty acids in the peroxisomes are transferred to the molecular oxygen. Oxidases are enzymes that's present in the peroxisomes which utilizes oxygen as an electron acceptor to oxidize organic compounds with the formation of H2O2 in the process which is further by an enzyme called as catalase.

Peroxisomes lack electron transport chain and hence electrons from the NADH and FADH2 produced during the oxidation of fatty acids are transferred directly to molecular oxygen with a release of NAD+ and FAD.

Answer to Question No 2 : D)

Explanation :

Ubiquinone is a lipid soluble electron carrier. Ubiquinone is denoted by Q. It's an electron carrier which is crucial in the electron transport chain. Q connects the first and the second complex of ETS to the third complex. Being lipid soluble, Ubiquinone can easily move across the hydrophobic core of the membrane. It delivers electrons to the next complex and itself reduced to QH2.