AP Biology Help » Cellular Biology » Cell Functions » Cellular Respiration » Understanding the Citric Acid Cycle
Explanation:

The citric acid cycle, also well-known as the Kreb"s cycle, occurs within the mitochondria of eukaryotic cells. In prokaryotic cells, it occurs in the cytosol.

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Explanation:

The citric acid cycle takes location in the mitochondrial matrix.

Glycolysis takes location in the cytosol, and the electron transport chain requires both the intermembrane space and the inner mitochondrial membrane.

Pyruvate from glycolysis is transported into the mitochondrial matrix for the citric acid cycle. Energy from the citric acid cycle permits prolots to be pumped to the intermembrane room. The electron move chain entails proteins alengthy the inner mitochondrial membrane, inevitably resulting in the activation of ATP synthase as a result of the influx of prolots alengthy their gradient.


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Example Question #1 : Understanding The Citric Acid Cycle


A sample of rats were fed glucose

*
 containing radioenergetic oxygen. After a few minutes, wright here would the radioenergetic oxygen be found?


Possible Answers:

*


*


*


*



Correct answer:


Explanation:

In cellular respiration, glucose initially undergoes glycolysis and also is damaged down right into two pyruvate molecules. As the pyruvate passes via the citric acid cycle, three molecules of 

*
 are developed. The radioenergetic oxygen molecules would certainly be discovered in the 
*
.

*
 is formed when electrons removed from glucose are used to reduce 
*
*
 is created by the phosphorylation of 
*
. The oxygen in 
*
 enters the mitochondrion as gaseous molecular oxygen from the setting, not from glucose. Finally, 
*
is diminished to water in cellular respiration and also serves as a reactant, quite than a product, in cell metabolism.


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Example Concern #1 : Understanding The Citric Acid Cycle


Wbelow does the Krebs cycle take place?


Possible Answers:

Intermembrane area of the mitochondria


In the cytosol


On the inner membrane of the mitochondria


Mitochondrial matrix


Correct answer:

Mitochondrial matrix


Explanation:

The Krebs cycle takes location in the mitochondrial matrix. The products of glycolysis, which takes place in the cytosol, are brought to the mitochondria for the Krebs cycle and also electron deliver chain. The electron carriers generated in the time of the Krebs cycle (NADH and also FADH2) are then supplied in the electron transport chain, which takes location on the inner membrane of the mitochondria.


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Example Question #51 : Cellular Respiration


Which of the complying with molecules is produced in the time of the Krebs cycle?

I. FADH2

II. ATP

III. Acetyl-CoA


Possible Answers:

I only


I and also II


II and also III


II only


Correct answer:

I and also II


Explanation:

A revolve of the Krebs cycle produces one ATP, three NADH, one FADH2, and two CO2.

Acetyl-CoA is not developed during Krebs cycle. It is created from the decarboxylation of a pyruvate molecule, which occurs prior to the Krebs cycle deserve to begin. Each revolve of Krebs cycle is initiated by one acetyl-CoA molecule. Remember that there are two acetyl-CoA created from the 2 pyruvate molecules (end product of glycolysis). For eextremely glucose molecule, the Krebs cycle produces two cycles: two ATP, 6 NADH, two FADH2, and four CO2.


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Example Inquiry #51 : Cellular Respiration


The ratio of carbons in one acetyl-CoA molecule to one glucose molecule is __________.


Possible Answers:
Correct answer:

*


Explanation:

Acetyl-CoA is the molecule that enters as the primary reactant in the Krebs cycle.

During glycolysis glucose is the main reactant. Glucose has six carbons. The process of glycolysis converts one molecule of glucose right into 2 molecules of pyruvate through 3 carbons each. Pyruvate then undergoes a decarboxylation reactivity prior to entering the Krebs cycle. Each pyruvate loses one carbon to develop carbon dioxide during this reaction, via the end product of acetyl-CoA. Acetyl-CoA is, for this reason, a two-carbon chain.

The ratio of carbon in acetyl-CoA to carbon in glucose is two-to-6, or 1:3.


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Example Concern #7 : Understanding The Citric Acid Cycle


Under anaerobic conditions, a eukaryotic cell will not undergo the Krebs cycle. Why is this?


Possible Answers:

Lack of NAD+ and FADH+


The reactant for the Krebs cycle is oxygen


The finish product for the Krebs cycle is oxygen


Lack of NADH and also FADH2


None of the other answers


Correct answer:

Lack of NAD+ and FADH+


Explanation:

The duty of the Krebs cycle is to produce the intermediates NADH and also FADH2, which will serve as electron donors in the electron transport chain (ETC). At the exact same time, the ETC creates NAD+ and also FADH+ as byproducts. The commodities have the right to then be turned about to proceed fueling the Krebs cycle. Since the ETC will not function in an anaerobic atmosphere, neither will certainly the Krebs cycle. The reactants will not be repleniburned, and also the cycle will be unable to proceed.

Oxygen is not directly involved as a reactant or product of the Krebs cycle. Oxygen is only straight used as an electron receptor in the electron transport chain.


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Example Question #1 : Understanding The Citric Acid Cycle


Which of the adhering to is not a product created during the citric acid cycle?


Possible Answers:

H+


GTP


FADH2


NAD+


CO2


Correct answer:

NAD+


Explanation:

NAD+ and FADH are offered as reactants in the citric acid cycle to make NADH and FADH2, which are provided in the electron move chain to transform additional ADP right into ATP. All of the various other selections are commodities in the citric acid cyclce. Prolots (H+) are a byproduct as soon as NAD+ is converted to NADH. Carbon dioxide (CO2) is developed in the time of carbohydrate conversions in the cycle. One GTP molecule is created by the cycle, and also includes practically equivalent energy to ATP.


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Example Inquiry #51 : Cellular Respiration


Which of the following is an example of an anabolic reaction?


Possible Answers:

Glucose-6-phosphate being isomerized to create fructose-6-phosphate


Citrate being converted to ketoglutarate


Acetyl CoA combining via oxaloacetate to develop citrate


Glucose being converted to two pyruvate molecules


Correct answer:

Acetyl CoA combining with oxaloacetate to form citrate


Explanation:

An anabolic reactivity is one in which larger molecules are made from combining smaller molecules. Even without learning the exact mechanics of the reactions provided in the answer options, we know that we are in search of a reaction in which multiple molecules integrate to develop a solitary molecule.

Out of the choices, there is just one time wright here a larger molecule is made by the combicountry of two smaller ones: once acetyl CoA (2 carbons) and oxaloacetate (4 carbons) come together in order to create citprice (6 carbons).

The generation of pyruvate from glucose outcomes in two smaller sized molecules from one larger molecule; this is a catalysis reactivity. The conversion of glucose-6-phosphate to fructose-6-phosphate is an isomerization reactivity. The transition from citprice to ketoglutarate is processed through an intermediate, yet is ultimately a catalysis reactivity.

See more: Why Does The Narrator Consider His Passing For White A &Quot;Capital Joke&Quot;?


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Example Question #51 : Cellular Respiration


Which of the following procedures occurs without oxygen?


Possible Answers:

Citric acid cycle


Fermentation


Krebs cycle 


Electron transport chain


Correct answer:

Fermentation


Explanation:

Fermentation is a catabolic process which does not call for oxygen. In contrast, Krebs cycle (citric acid cycle) and also oxidative phosphorylation (chemiosmosis and electron transport) do usage oxygen. Aerobic respiration is much more efficient than anaerobic respiration in developing ATP.


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