What happens during the Krebs cycle? (2 points) ATP and NADH from food are converted to CO2 and O2. NADH from glycolysis is converted to ATP and O2 molecules. Glucose is broken down in a cycle of reactions to form pyruvate. Pyruvate is broken down in a series of reactions to form CO2.

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15-02-2017
Biology

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What happens during the Krebs cycle? (2 points) ATP and NADH from food are converted to CO2 and O2. NADH from glycolysis is converted to ATP and O2 molecules. Glucose is broken down in a cycle of reactions to form pyruvate. Pyruvate is broken down in a series of reactions to form CO2.

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Riia Riia · Answer 1 · 2019-07-08T17:36:17+02:00

Answer:

Pyruvate is broken down in a series of reactions to form CO2.

Explanation:

Krebs cycle is a part of aerobic cellular respiration which comprises 3 important steps mentioned below:

(1) Glycolysis

(2) Krebs cycle (also known as TCA cycle or citric acid cycle)

(3) ETC ( electron transport chain)

In glycolysis, a glucose molecule is broken down into a 3 carbon compund pyruvate.

After glycolysis, pyruvate enters PDH complex which is located in mitochondria wherein it is converted into a 2 carbon compound acetyl coA and one molecule of CO2 is released. After acetyl coA is produced, it combines with a 4 carbon compound named as oxaloacetate to produce a 6 carbon compound named as citric acid, this is the initial step of krebs cycle. A series of other compounds are produced during Krebs cycle along with the production of high energy molecules named as NADH, FADH2 and ATP/GTP. Apart from this, carbon dioxide is also released in the process.

PDH complex is present in mitochondria and Krebs cycle also takes place in mitochondria. Both of these processes are responsible for the production of CO2 which occurs by the degradation of pyruvate.

Electron transport chain is responsible for converting these high energy molecules NADH and FADH2 into ATP which are further used for generation of energy for our day to day activities.

So, Option 1 is incorrect because it is pyruvate which is being converted into CO2 not ATP and NADH. Option 2 is also incorrect because NADH is not being converted to ATP and O2, in fact it is being produced in Krebs cycle. Option 3 is also incorrect because glucose is broken down into pyruvate during glycolysis not in Krebs cycle.

So, option 4th is correct and most appropriate answer for this question.