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Chapter 7: Problem 7

How many ATP molecules are used and produced per molecule of glucose during glycolysis? a. The first half of glycolysis uses 2 ATPs, and the second half of glycolysis produces 4 ATPs. b. The first half of glycolysis produces 2 ATPs, and the second half of glycolysis uses 4 ATPs. c. The first half of glycolysis uses 4 ATPs, and the second half of glycolysis produces 2 ATPs. d. The first half of glycolysis produces 4 ATPS, and the second half of glycolysis uses 2 ATPs.

Short Answer

Expert verified
a. The first half of glycolysis uses 2 ATPs, and the second half of glycolysis produces 4 ATPs.

Step by step solution

01

Title - Understand Glycolysis Phases

Glycolysis is divided into two phases: the energy investment phase and the energy payoff phase.
02

Title - Energy Investment Phase

In the first half of glycolysis (energy investment phase), 2 ATP molecules are used to phosphorylate glucose and convert it into intermediate molecules.
03

Title - Energy Payoff Phase

In the second half of glycolysis (energy payoff phase), 4 ATP molecules are produced through substrate-level phosphorylation.
04

Title - Calculate Net ATP Production

Calculate the net ATP production by subtracting the ATP used from the ATP produced. Net ATP = 4 ATP produced - 2 ATP used = 2 ATP.
05

Title - Identify Correct Answer

Based on the information given, the correct answer is: a. The first half of glycolysis uses 2 ATPs, and the second half of glycolysis produces 4 ATPs.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Energy Investment Phase
The energy investment phase is the first part of the glycolysis process. During this phase, a molecule of glucose is prepared for breakdown. This preparation requires energy. Specifically, 2 ATP molecules are used to add phosphate groups to the glucose. These ATP molecules provide the energy needed to convert glucose into fructose-1,6-bisphosphate, making the glucose more reactive. This process is crucial because it primes the glucose for those steps in glycolysis that release energy.
Energy Payoff Phase
The energy payoff phase is the second part of glycolysis. This phase generates energy in the form of ATP molecules. Here, the intermediates from the investment phase are further broken down, leading to the formation of pyruvate. In the process, 4 ATP molecules are produced by substrate-level phosphorylation. This phase not only recoups the 2 ATP molecules used in the investment phase but also generates an additional 2 ATP molecules. Additionally, this phase produces 2 NADH molecules, which can be used in other cellular processes to generate more ATP.
Net ATP Production
Net ATP production refers to the total number of ATP molecules gained from glycolysis after accounting for the ATP molecules used. Here's the breakdown:
  • 2 ATP molecules are used during the energy investment phase.
  • 4 ATP molecules are produced during the energy payoff phase.
To calculate the net ATP, subtract the ATP used from the ATP produced: \[ \text{Net ATP} = 4 \ \text{ATP produced} - 2 \ \text{ATP used} = 2 \ \text{ATP} \] Therefore, the net ATP gain from glycolysis is 2 ATP molecules per glucose molecule.
Glycolysis Process
Glycolysis is a vital metabolic pathway that converts glucose into pyruvate. This process occurs in the cytoplasm of cells. The entire pathway consists of ten enzyme-catalyzed reactions. Glycolysis can be divided into two main phases: the energy investment phase and the energy payoff phase.
In the energy investment phase, ATP molecules are used to activate glucose and prepare it for breakdown. In the energy payoff phase, energy is harvested, resulting in the production of ATP and NADH. The end product of glycolysis, pyruvate, can then enter other metabolic pathways such as the citric acid cycle or fermentation, depending on the availability of oxygen.

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Most popular questions from this chapter

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