Thanks guys, will rate lifesaver asap. The electron transport chain is located p

Question

Thanks guys, will rate lifesaver asap.

The electron transport chain is located predominantly in the:
A. Outer membrane of the mitochondria
B. Intermembrane space of the mitochondria
C. Inner membrane of the mitochondria
D. Matrix of the mitochondria
E. Cytoplasm of the cell


In the absence of oxygen, the primary purpose of fermentationis to:
A. produce amino acids for protein synthesis
B. generate a proton gradient for ATP synthesis
C. oxidize glucose to generate reduce electron carriers
D. generate alcohol for beverages
E. regenerate NAD+ from NADH allowing glycolysis to continue

Explanation / Answer

The electron transport chain is a series of proteincomplexes that transfer hyrdogen ions from the inside of themitochondrial inner membrane to the outside. Fermentation is a pathway alternative to normal (aerobic)metabolism. Glycolysis functions by changing the state ofelectron carrier molecules such as NAD+/NADH and allowing then tocarry electrons to the electron transport chain. Withoutoxygen, the electron transport chain does not function, so the NADHgenerated by glycolysis has no where to go. Fermentation isanother pathway that can use NADH and convert it back to the NAD+that glycolysis needs to continue.

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