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Answered 2009-09-11 18:08:55

Glucose is a six carbon sugar when glycolysis is over it is split into two three carbon molecules called pyruvic acid (pyruvates). When this is done the link cycle begins (second stage of respiration) . In the link reaction the pyruvic acid loses a carbon that becomes CO2. The remaining two carbons are called acetic acid. This then meets enzyme coenzyme A and becomes acetylcoenyme A. This combination is the start of the kreb's cycle.

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What is the role of pyruvate in cellular respiration?

Pyruvates enter the Krebs Cycle


What molecule is reduced during glycolysis?

Glucose is reduced. During glycolysis, glucose is reduced to two pyruvates, which have 3 carbons. The pyruvates enter the mitochondria to be used in Kreb cycle.


How does the product of glycolysis enter the Krebs cycle?

Attached to coenzyme A as acetyl-CoA. This is the molecule that enters the Krebs


When does the Krebs cycle begin?

When pyruvic acid produces by glycolysis enter the mitochondrion.


What happens to pyruvate molecules formed in glycolysis in the absence of oxygen?

they will enter the Krebs cycle


For each glucose that enter glycolysis how many acetyl CoA enters the Krebs Acid cycle?

2


What is a product of aerobic respiration that will enter into and begin the Krebs cycle?

glycolysis yiels 2 pyruvate molecules that will undergo Kreb's cycle


How many co2 molecules are released per glucose molecule in glycolysis?

Glycolysis itself does not output CO2. Just after glycolysis the 2 pyruvates which are derived from the glucose molecule during glycolysis, are converted into 2 acetyl CoA in the process of which one CO2 per pyruvate is released.After that the 2 acetyl CoA's enter the Kerbs cycle and a further 2 CO2's are produced for each.In total 6 CO2's are created after glycolysis2 during the conversion of pyruvates to Acetyl CoA4 Durint the TCA/ Citric Acid/ Kerbs Cycle


How does the Krebs cycle depend on glycolysis?

because from glycolisis comes pyruvate, and then it is turned into acetylCoA. Without acetylCoA, nothgn will be able to enter the Krebs Cycle, otherwise known as the Citric acid cycle. Once the AcetylCoA comes in, after the prep cycle, it can then bind to RuBp, turnign into a six carbon sugar.


What happens after glycolysis?

The pyruvates enter the mitochondria to further undergo cellular respiration. The ATP molecules are used by the cell.


Does pyruvic acid enters the krebs cycle?

Pyruvic acid cycle does enter the Krebs cycle and is turned into acetyl coenzyme A.


What can you do with the end product of glycolysis?

The end products of glycolysis enter the Kreb's Cycle or Citric Acid Cycle.


Do humans require oxygen to enter the Krebs cycle?

yeah!


When fats are broken down as energy sources their components enter?

They enter the Krebs Cycle.


How many times can a single glucose molecule drive the Krebs cycle?

1 glucose ------by glycolysis end up with 2 molecules of pyruvic acid. one pyruvic = 3 carbon > 2 pyruvic acid enter to kerb cycle after changing to Acetyl CO A So this means 1 glucose drive the Krebs cycle two times


Can pyruvic acid use in the Krebs cycle?

Pyruvic acid is the end product of glycolysis that enters the mitochondria for the Kreb's cycle. Pyruvic acid however does not enter the mitochondria in the acid form; instead it enters in the form of salts and as the anionic pyruvate.


Where in the process of cellular respiration is carbon dioxide produced?

In the Kreb's Cycle and in the short reaction when the pyruvates enter the mitochontria.


Where does nadh and fadh go after it leaves the Krebs cycle?

After the Krebs cycle, NADH2 and FADH2 enter the electron transport chain where ATP and water are produced by Hydrogen Atoms.


How many times does each glucose enter the Krebs cycle?

6 6


Where do the catabolism products of fatty acid breakdown enter into the Krebs cycle?

Acetyl CoA.


When proteins are used as energy sources their breakdown subunits usually enter?

the Krebs cycle


How many carbons from one glucose molecule enter one round of Krebs cycle?

No


Answers to McGraw Hill Energy in a Cell virtual lab?

H20 co2 chloryphyllenergyelectron transferatp/nadphcalvin cycleglucose o2glycolysispyruvic acidkrebs cycleatp/h2o/co2enter answers from left to right.


How does pyruvate enter the Krebs Cycle?

Pyruvate enters the Krebs cycle via an intermediate called acetyl CoA.Pyruvate is formed in the cytoplasm as the end product of glycolysis. Pyruvate enters a mitochondrion, in the matrix of which it encounters the enzyme pyruvate dehydrogenase. This enzyme catalyzes the reaction of pyruvate with coenzyme A to form acetyl CoA. This reaction is sometimes called the link reaction, as it links glycolysis to the Krebs cycle (= citric acid cycle, or tricarboxylic acid cycle)."Pyruvate dehydrogenase" is in fact a huge complex (bigger than a ribosome) consisting of three enzymes and a number of other substances, including coenzymes. In the course of the reaction NAD+ is reduced to NADH. A molecule of CO2 is also produced. So this reaction involves a both an oxidation and a decarboxylation.Acetyl CoA then reacts with oxaloacetate to form citrate. Both oxaloacetate and citrate are intermediates of the Krebs cycle.


What does the electron transport chain the high - energy electrons from the Krebs cycle for?

The high E electrons that enter Krebs are used to reduce carbon dioxide to carbohydrate. Not all high E electrons that leave the light-dependent reactions go to the Krebs cycle. Some are used to produce the ATP that drives the endergonic Krebs cycle.