Question

How many electrons must move down the Electron Transport Chain before energy is made?

(1 point)
4
3
5
2

Answer 1

[AI-generated answer — Bot GPT 3.5]

2

Answer 2

Which 3-carbon molecule is one of the final products of glycolysis? (1 point)

pyruvic acid
ADP
oxaloacetic acid
NAD+

Answer 3

[AI-generated answer — Bot GPT 3.5]

pyruvic acid

Answer 4

[AI-generated answer — Explain Bot]

To determine the number of electrons that must move down the Electron Transport Chain (ETC) before energy is made, we need to understand the process of electron movement in the ETC.

The ETC is a series of protein complexes located in the inner mitochondrial membrane. It's responsible for generating adenosine triphosphate (ATP), the main energy currency of cells.

During aerobic respiration, NADH and FADH2, which are electron carriers, donate electrons to the ETC. These electrons then move through a series of protein complexes, passing from one carrier to the next, while releasing energy. This energy is used to pump protons (H+) across the inner mitochondrial membrane, creating an electrochemical gradient.

The movement of electrons down the ETC creates a flow of protons back into the matrix of the mitochondria through a protein channel called ATP synthase. This proton flow generates ATP, which is the ultimate energy product of the ETC.

In the ETC, each NADH molecule transfers two electrons, while each FADH2 molecule transfers one electron. Therefore, to produce energy, a total of 4 electrons (from 2 NADH molecules) or 2 electrons (from 2 FADH2 molecules) need to move down the ETC.

Since the given options are 4, 3, 5, and 2, the correct answer is 4.