Explanation:

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

You are watching: What takes place in the cytosol of a eukaryotic cell


Explanation:

The citric acid cycle takes location in the mitochondrial matrix.

Glycolysis takes location in the cytosol, and also the electron transfer chain involves both the intermembrane area 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 protons to be pumped to the intermembrane area. The electron carry chain requires proteins along the inner mitochondrial membrane, inevitably resulting in the activation of ATP synthase as a result of the influx of proloads alengthy their gradient.


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Example Inquiry #1 : Understanding The Citric Acid Cycle


A sample of rats were fed glucose

*
 containing radioenergetic oxygen. After a few minutes, where would certainly the radioactive oxygen be found?


Possible Answers:

*


*


*


*



Correct answer:


Explanation:

In cellular respiration, glucose initially undergoes glycolysis and is broken down into 2 pyruvate molecules. As the pyruvate passes with the citric acid cycle, 3 molecules of 

*
 are developed. The radioactive oxygen molecules would certainly be uncovered in the 
*
.

*
 is developed as soon as electrons removed from glucose are provided to reduce 
*
*
 is produced by the phosphorylation of 
*
. The oxygen in 
*
 enters the mitochondrion as gaseous molecular oxygen from the setting, not from glucose. Finally, 
*
is decreased to water in cellular respiration and serves as a reactant, fairly than a product, in cell metabolism.


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Example Question #1 : Understanding The Citric Acid Cycle


Wright here 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 area in the mitochondrial matrix. The products of glycolysis, which takes area in the cytosol, are carried to the mitochondria for the Krebs cycle and also electron deliver chain. The electron carriers generated throughout the Krebs cycle (NADH and also FADH2) are then used in the electron transfer chain, which takes place on the inner membrane of the mitochondria.


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Example Inquiry #51 : Cellular Respiration


Which of the adhering to molecules is produced during the Krebs cycle?

I. FADH2

II. ATP

III. Acetyl-CoA


Possible Answers:

I only


I and also II


II and III


II only


Correct answer:

I and also II


Explanation:

A turn of the Krebs cycle produces one ATP, 3 NADH, one FADH2, and also two CO2.

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


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Example Inquiry #51 : Cellular Respiration


The proportion 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 major reactant in the Krebs cycle.

Throughout glycolysis glucose is the main reactant. Glucose consists of 6 carbons. The procedure of glycolysis converts one molecule of glucose right into two molecules of pyruvate with three carbons each. Pyruvate then undergoes a decarboxylation reactivity prior to entering the Krebs cycle. Each pyruvate loses one carbon to develop carbon dioxide throughout this reaction, with the finish product of acetyl-CoA. Acetyl-CoA is, hence, a two-carbon chain.

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


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Example Question #7 : Understanding The Citric Acid Cycle


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


Possible Answers:

Lack of NAD+ and FADH+


The reactant for the Krebs cycle is oxygen


The end product for the Krebs cycle is oxygen


Lack of NADH and FADH2


None of the various other answers


Correct answer:

Lack of NAD+ and also FADH+


Explanation:

The function of the Krebs cycle is to develop the intermediates NADH and FADH2, which will certainly serve as electron donors in the electron carry chain (ETC). At the exact same time, the ETC creates NAD+ and FADH+ as bycommodities. The products deserve to then be turned roughly to proceed fueling the Krebs cycle. Because the ETC will not feature in an anaerobic setting, neither will certainly the Krebs cycle. The reactants will certainly not be replenimelted, and also the cycle will be unable to continue.

Oxygen is not straight involved as a reactant or product of the Krebs cycle. Oxygen is just straight supplied as an electron receptor in the electron deliver chain.


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Example Inquiry #1 : Understanding The Citric Acid Cycle


Which of the following is not a product developed during the citric acid cycle?


Possible Answers:

H+


GTP


FADH2


NAD+


CO2


Correct answer:

NAD+


Explanation:

NAD+ and also FADH are supplied as reactants in the citric acid cycle to make NADH and FADH2, which are supplied in the electron transport chain to convert extra ADP right into ATP. All of the other selections are commodities in the citric acid cyclce. Proloads (H+) are a byproduct when NAD+ is converted to NADH. Carbon dioxide (CO2) is developed during carbohydrate conversions in the cycle. One GTP molecule is produced by the cycle, and consists of virtually indistinguishable energy to ATP.


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Example Concern #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


Citprice being converted to ketoglutarate


Acetyl CoA combining with oxaloacetate to develop citrate


Glucose being converted to 2 pyruvate molecules


Correct answer:

Acetyl CoA combining via oxaloacetate to develop citrate


Explanation:

An anabolic reaction is one in which larger molecules are made from combining smaller sized molecules. Even without knowing the precise mechanics of the reactions given in the answer selections, we understand that we are in search of a reaction in which multiple molecules combine to form a single molecule.

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

The generation of pyruvate from glucose outcomes in two smaller sized molecules from one bigger molecule; this is a catalysis reactivity. The conversion of glucose-6-phosphate to fructose-6-phosphate is an isomerization reaction. The change from citrate to ketoglutarate is processed with an intermediate, but is ultimately a catalysis reaction.


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Example Question #51 : Cellular Respiration


Which of the complying with processes occurs without oxygen?


Possible Answers:

Citric acid cycle


Fermentation


Krebs cycle 


Electron carry chain


Correct answer:

Fermentation


Explanation:

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


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