Question

level 3
q3
what are nadh and fadh₂ used for?
a. give energy to break down glucose
b. nothing, they are waste products
c. act as electron carriers which give away their electrons to the etc
d. they break down into atp

○ a. give energy to break down glucose
○ b. nothing, they are waste products
○ c. act as electron carriers which give away their electrons to the etc
○ d. they break down into atp

Explanation:

• Option A: Energy is used to break down glucose (like in glycolysis), and NADH/FADH₂ are products of glucose breakdown, not the source of energy for it. So A is wrong.
• Option B: NADH and FADH₂ are crucial in cellular respiration, not waste products. So B is wrong.
• Option C: In cellular respiration, NADH and FADH₂ act as electron carriers. They donate their electrons to the Electron Transport Chain (ETC), which is used to generate ATP. This matches their function.
• Option D: NADH and FADH₂ do not break down into ATP directly. They provide electrons to the ETC, which then drives ATP synthesis. So D is wrong.

Answer:

C. Act as electron carriers which give away their electrons to the ETC