Which of the following statements is not true? (a)...

Name: Problem 5, Chapter 5: Biology Now
Uploaded: 2021-09-08T05:53:44-08:00
Duration: 2 min 4 s
Channel: Sana Riaz
Description: Which of the following statements is not true? (a) Glycolysis is the first stage of cellular respiration. (b) Glycolysis can proceed under low oxygen levels with the assistance of fermentation. (c) Glycolysis produces less ATP than does either the Krebs cycle or oxidative phosphorylation. (d) Glycolysis produces most of the ATP required by aerobic organisms like us.

Which of the following statements is not true? (a) Glycolysis is the first stage of cellular respiration. (b) Glycolysis can proceed under low oxygen levels with the assistance of fermentation. (c) Glycolysis produces less ATP than does either the Krebs cycle or oxidative phosphorylation. (d) Glycolysis produces most of the ATP required by aerobic organisms like us.

Which of the following statements is not true?
(a) Glycolysis is the first stage of cellular respiration.
(b) Glycolysis can proceed under low oxygen levels with the assistance of fermentation.
(c) Glycolysis produces less ATP than does either the Krebs cycle or oxidative phosphorylation.
(d) Glycolysis produces most of the ATP required by aerobic organisms like us.

Key Concepts

Cellular Respiration

Cellular respiration is a multi-step metabolic process whereby cells convert nutrients into adenosine triphosphate (ATP), the energy currency of the cell. It involves a series of biochemical pathways that include glycolysis, the Krebs cycle, and oxidative phosphorylation. Each of these pathways plays a distinct role in breaking down substrates and is interconnected to efficiently extract energy.

Glycolysis

Glycolysis is the initial step in cellular respiration and occurs in the cytoplasm of the cell. It involves the breakdown of glucose into pyruvate, yielding a small amount of ATP and NADH. This process does not require oxygen, allowing it to function under both aerobic and anaerobic conditions.

Fermentation

Fermentation is an anaerobic process that follows glycolysis when sufficient oxygen is not available. It regenerates NAD+ from NADH, allowing glycolysis to continue producing ATP even in low-oxygen environments, though it yields much less ATP per mole of glucose than aerobic pathways.

ATP Production

ATP production in cellular respiration varies by stage. Glycolysis produces a limited amount of ATP directly, while the Krebs cycle and especially oxidative phosphorylation contribute a much larger share of ATP generation. Understanding the relative contributions of these processes is crucial to comprehending overall energy yield during respiration.

Krebs Cycle

Also known as the citric acid cycle, the Krebs cycle takes place in the mitochondria and processes pyruvate into carbon dioxide while generating reduced electron carriers, NADH and FADH2. These carriers are essential for feeding electrons into the electron transport chain, magnifying the ATP yield.

Oxidative Phosphorylation

Oxidative phosphorylation, which includes the electron transport chain and chemiosmosis, is the final stage of cellular respiration conducted in the mitochondria. It creates a proton gradient used to drive the synthesis of a large amount of ATP, making it the most productive step in the overall process of cellular respiration.

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