Use the accompanying figure to answer the following question(s).
-The accompanying figure shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?
A) oxygen, carbon dioxide, and water
B) NAD+, FAD, and electrons
C) NADH, FADH2, and protons
D) NADH, FADH2, and O2
E) oxygen and protons

Question

Use the accompanying figure to answer the following question(s). 
-The accompanying figure shows the electron transport chain. Which of the following is the combination of substances that is initially added to the chain?
A) oxygen, carbon dioxide, and water 
B) NAD+, FAD, and electrons 
C) NADH, FADH2, and protons 
D) NADH, FADH2, and O2 
E) oxygen and protons

Quizplus · Accepted Answer

The combination of substances that is initially added to the electron transport chain is NADH and FADH2, which are molecules generated from previous steps in cellular respiration. Oxygen is the final electron acceptor in the electron transport chain but is not initially added to the chain. Protons are also involved in the chain but are not initially added as a substance. Carbon dioxide is not a part of the electron transport chain.

Use the Accompanying Figure to Answer the Following Question(s)