How pyruvate from glycolysis is converted to acetyl CoA so it can enter the citric acid cycle. Pyruvate is modified by
removal of a carboxyl group followed by oxidation, and then attached to Coenzyme A
.
How does pyruvate become pyruvic acid?
Pyruvic acid is formed as an end product of glycolysis, a process that breaks down glucose (a six-carbon molecule) into two molecules of pyruvate (a three-carbon molecule) and simultaneously yields a small net gain of the universal energy storage molecule adenosine triphosphate (ATP), used to power cellular function.
Is pyruvate produced in the citric acid cycle?
A glucose (six carbons) molecule enters glycolysis and produces two three carbon molecules (pyruvate)
. Each pyruvate is broken down into a two carbon acetyl-CoA molecule that enters the citric acid cycle. Each acetyl-CoA molecule produces three and one in the citric acid cycle.
How does pyruvate enter the mitochondrial matrix?
To enter mitochondria, pyruvate crosses the outer mitochondrial membrane (OMM) to reach the intermembrane space (IMS), probably through the large, relatively non-specific, voltage-dependent anion channel (VDAC), and it is then transported together with a proton across the inner mitochondrial membrane (IMM) by the …
Where does pyruvate processing occur?
Where does the pyruvate processing occur? The mitochondrion has a double membrane, and the space inside the inner membrane is called the matrix. So pyruvate processing and the citric acid cycle take place
inside the mitochondrial matrix
.
How does pyruvate turn into acetyl CoA?
During the breakdown of pyruvate, electrons are transferred to NAD+ to produce NADH, which will be used by the cell to produce ATP. In the final step of the breakdown of pyruvate,
an acetyl group is transferred to Coenzyme A
to produce acetyl CoA.
What happens to pyruvate after glycolysis?
In eukaryotic cells, the pyruvate molecules produced at the end of glycolysis are
transported into mitochondria
, which are the sites of cellular respiration. There, pyruvate will be transformed into an acetyl group that will be picked up and activated by a carrier compound called coenzyme A (CoA).
How is pyruvate imported into the mitochondrial matrix for use in the citric acid cycle?
How is pyruvate imported into the mitochondrial matrix for use in the citric acid cycle? (
Pyruvate is transported across the mitochondrial inner membrane using the proton gradient
. The transport protein is a symporter, moving protons in the same direction as the pyruvate molecule.)
What factor determines the pathway that pyruvic acid?
A: Answer is c.)
coleoptile
.
What is the relationship between pyruvate and pyruvic acid?
Pyruvate is formed when pyruvic acid loses a hydrogen atom. But, both terms are used interchangeably. Pyruvic acid at pH of the human body in the form of pyruvate. The main difference between pyruvate and pyruvic acid is that
pyruvate is an anion whereas pyruvic acid is a neutral molecule
.
How does pyruvate become lactic acid?
Two pyruvates are converted to two lactic acid molecules, which ionize to form lactate
. In this process two NADH + H+ are converted to two NAD+. Our muscle cells can undergo this process when they are in oxygen debt.
Is pyruvate a substrate or product?
Pyruvate is the end-product of glycolysis,
a major substrate
for oxidative metabolism, and a branching point for glucose, lactate, fatty acid and amino acid synthesis.
Which of these are the products of one pyruvate molecule that cycles through the citric acid cycle?
The Citric Acid Cycle
In mitochondria, pyruvate will be transformed into
a two-carbon acetyl group
(by removing a molecule of carbon dioxide) that will be picked up by a carrier compound called coenzyme A (CoA), which is made from vitamin B
5
. The resulting compound is called acetyl CoA. (Figure 4.17).
Which of the following are produced during the citric acid cycle?
The citric acid cycle is a series of reactions that produces
two carbon dioxide molecules, one GTP/ATP, and reduced forms of NADH and FADH2
.
How does the pyruvate molecule move across the mitochondrial membrane?
Transport of pyruvate across the outer mitochondrial membrane appears to be easily accomplished
via large non-selective channels such as voltage-dependent anion channels/porin, which enable passive diffusion
[8].
How does pyruvate enter the mitochondria quizlet?
Pyruvate is a charged molecule, so in eukaryotic cells it must enter the mitochondrion
via active transport, with the help of a transport protein
.
What is produced during pyruvate oxidation?
The inputs (reactants) of pyruvate oxidation are pyruvate, NAD+, and Coenzyme A. The outputs (products) are
carbon dioxide, NADH, and acetyl CoA
.
What occurs in pyruvate processing?
Pyruvate processing
Each pyruvate is processed to release one molecule of CO2, and the remaining two carbons are used to form the compound acetyl CoA
. The oxidation of pyruvate results in more NAD+ being reduced to NADH. Figure 9.1 Glucose Is the Hub of Energy Processing in Cells.
What is the starting material for pyruvate processing?
Glycolysis converts the
6-carbon glucose
into two 3-carbon pyruvate molecules. This process occurs in the cytoplasm of the cell, and it occurs in the presence or absence of oxygen.
What are the inputs of pyruvate processing?
| glycolisis location cytoplasm | pyruvate processing inputs pyruvate, NAD+ NP | pyruvate processing outputs acetyl coA, NADH, co2 (CAN) | citric acid cycle location mitochondrial matrix | citric acid cycle inputs FAD+,NAD+, ATP,acetyl coA NAFA |
|---|
How is pyruvate converted to acetyl CoA quizlet?
When one molecule of pyruvate enters pyruvate oxidation in the mitochondrial matrix
, it is converted into one molecule of acetyl-CoA when part of the one pyruvate molecule is oxidized and has some that splits into carbon dioxide.
What is the conversion of pyruvate to acetyl CoA called?
Pyruvate decarboxylation or pyruvate oxidation, also known as the link reaction (or oxidative decarboxylation of pyruvate)
, is the conversion of pyruvate into acetyl-CoA by the enzyme complex pyruvate dehydrogenase complex.
How is pyruvate produced in glycolysis?
In a series of steps that produce one NADH and two ATP,
a glyceraldehyde-3-phosphate molecule is converted into a pyruvate molecule
. This happens twice for each molecule of glucose since glucose is split into two three-carbon molecules, both of which will go through the final steps of the pathway.
Where does the pyruvic acid produced by glycolysis go next?
Where does the pyruvic acid produced by glycolysis go next? In eukaryotic cells, the pyruvate molecules produced at the end of glycolysis are transported into
mitochondria
, which are the sites of cellular respiration.
What is the role of pyruvate in glycolysis?
Pyruvate is
the output of the anaerobic metabolism of glucose
known as glycolysis. Pyruvate can be converted into carbohydrates via gluconeogenesis, to fatty acids or energy through acetyl-CoA, to the amino acid alanine, and to ethanol.
