The primary function of the mitochondrion is the production of ATP. To carry out this function, the mitochondrion must have all of the following except

Question

BlackTom AI · Accepted Answer

Glycolysis takes place in the cytosol, not inside mitochondria, so mitochondria do not need the enzymes for glycolysis.

1) Relevant knowledge points and concepts
- Oxidative phosphorylation in mitochondria produces most cellular ATP by coupling the electron transport chain (ETC) to ATP synthase via a proton gradient.
- The Krebs cycle (citric acid cycle) and pyruvate dehydrogenase complex are located in the mitochondrial matrix and provide NADH/FADH2 to the ETC.
- The ETC is composed of membrane-bound complexes in the inner mitochondrial membrane; several of these complexes act as proton pumps to move H+ into the intermembrane space, creating the proton-motive force used by ATP synthase.
- Glycolysis occurs in the cytosol and converts glucose to pyruvate, supplying substrates (pyruvate, NADH) for mitochondrial metabolism.

2) Step-by-step reasoning
Step 1: For mitochondrial ATP production by oxidative phosphorylation you need: (a) Krebs cycle enzymes to generate reduced electron carriers (NADH, FADH2), (b) membrane-bound electron transport chain complexes to accept electrons, and (c) proton pumps (complexes I, III, IV) to build the proton gradient.
Step 2: Glycolytic enzymes catalyze the ten-step breakdown of glucose to pyruvate in the cytoplasm before pyruvate enters mitochondria.
Step 3: Since glycolysis is cytosolic, these enzymes are not required inside mitochondria for mitochondrial ATP synthesis.

3) Calculations
None required.

4) Why the correct answer is correct
"Enzymes for glycolysis" are not necessary inside the mitochondrion because glycolysis occurs outside the organelle; mitochondria rely on imported pyruvate and NADH/FADH2 from cytosolic metabolism.

5) Why other options are incorrect
- a. Enzymes for the Krebs cycle: required in the matrix to generate NADH/FADH2 for the ETC.
- b. Membrane-bound electron transport chain: required in the inner membrane to transfer electrons and drive proton pumping.
- d. Proton pumps: essential (components of complexes I, III, IV) to create the proton gradient that powers ATP synthase.

Conclusion: The correct answer is c. Enzymes for glycolysis, which matches the provided answer.

The primary function of the mitochondrion is the production of ATP. To carry out this function, the mitochondrion must have all of the following except单项选择题

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Which of the following stages of cellular respiration directly produces the LEAST reduced electron carriers?

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The primary function of the mitochondrion is the production of ATP. To carry out this function, the mitochondrion must have all of the following except单项选择题

类似问题

What is the term for the process by which cells convert glucose into energy?

Question at position 14 Indirect calorimetry is based upon the concept that Oxygen is used in ATP production and ___ is a by-product of ATP production.NADHFADH2WaterCarbon dioxide

Question at position 13 For an unknown macronutrient, approximately 14 molecules of oxygen are required for oxidation and 10 molecules of carbon dioxide are produced. The RQ of this molecule is:0.930.830.711.00

Which of the following stages of cellular respiration directly produces the LEAST reduced electron carriers?

During cellular respiration, _____ is reduced to eventually form _____.

Which of the following stages of cellular respiration directly produces the LEAST reduced electron carriers?

Which of the following cellular processes would be most directly interfered with (ignoring downstream processes) by a toxin that binds to pyruvate and inactivates it?

How many ATP molecules are generated from the complete oxidation (aerobic utilisation) of one glucose molecule?

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希望你的学习变得更简单

During cellular respiration, _ is reduced to eventually form _.