Table of Contents
- 1 What two processes can pyruvate undergo?
- 2 What two processes occur when acetyl CoA is formed from pyruvate?
- 3 How are the processes of photosynthesis and respiration closely linked?
- 4 What three steps are included in the breakdown of pyruvate?
- 5 Which one of the following is formed as pyruvate is converted to acetyl CoA?
- 6 What does the link reaction convert pyruvate into?
- 7 What happens during grooming phase in pyruvate?
- 8 What is the mechanism of pyruvate oxidation?
What two processes can pyruvate undergo?
Pyruvate is a key intersection in the network of metabolic pathways. Pyruvate can be converted into carbohydrates via gluconeogenesis, to fatty acids or energy through acetyl-CoA, to the amino acid alanine, and to ethanol. Therefore, it unites several key metabolic processes.
What is the process of pyruvate processing?
Pyruvate oxidation steps Pyruvate is produced by glycolysis in the cytoplasm, but pyruvate oxidation takes place in the mitochondrial matrix (in eukaryotes). So, before the chemical reactions can begin, pyruvate must enter the mitochondrion, crossing its inner membrane and arriving at the matrix.
What two processes occur when acetyl CoA is formed from pyruvate?
Acetyl CoA links glycolysis and pyruvate oxidation with the citric acid cycle. In the presence of oxygen, acetyl CoA delivers its acetyl group to a four-carbon molecule, oxaloacetate, to form citrate, a six-carbon molecule with three carboxyl groups.
What does pyruvate oxidation produce?
Pyruvate is the end product of a biochemical pathway called glycolysis, a series of reactions that converts one molecule of glucose into two molecules of pyruvate. Pyruvate then undergoes pyruvate oxidation to produce acetyl CoA, an intermediate in the Krebs cycle.
How are the processes of photosynthesis and respiration closely linked?
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide. It is the released oxygen that is used by us and most other organisms for cellular respiration.
What is the main function of pyruvate?
Functions of Pyruvate. The primary function of pyruvate is to serve as the transporter of carbon atoms into the mitochondrion for complete oxidation into carbon dioxide.
What three steps are included in the breakdown of pyruvate?
After pyruvate is produced from glycolysis, it enters the mitochondria to begin aerobic respiration. Aerobic respiration begins with the conversion of pyruvate to acetyl CoA. This conversion takes place in three steps: decarboxylation, the reduction of NAD+, and the attachment of coenzyme A.
What is the by product created when a 3 carbon pyruvate is converted to a 2 carbon acetate?
Pyruvate is the end product of glycolysis. After glycolysis, the three-carbon molecule pyruvate is converted into the two-carbon molecule acetyl-coenzyme A (acetyl-CoA). This is carried out by a combination of three enzymes collectively known as the pyruvate dehydrogenase complex.
Which one of the following is formed as pyruvate is converted to acetyl CoA?
Upon entering the mitochondrial matrix, a multienzyme complex converts pyruvate into acetyl CoA. In the process, carbon dioxide is released, and one molecule of NADH is formed.
What happens to pyruvate molecules formed in glycolysis?
1: Glycolysis produces 2 ATP, 2 NADH, and 2 pyruvate molecules: Glycolysis, or the aerobic catabolic breakdown of glucose, produces energy in the form of ATP, NADH, and pyruvate, which itself enters the citric acid cycle to produce more energy. …
What does the link reaction convert pyruvate into?
In the link reaction, the 3-carbon compound pyruvate (or pyruvic acid) is converted into the 2-carbon compound acetyl coenzyme A. In a series of steps, the pyruvate molecule undergoes the following changes: This carbon atom is released in the form of carbon dioxide.
What made the two processes different from each other of cellular respiration and photosynthesis?
While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water. While photosynthesis requires carbon dioxide and releases oxygen, cellular respiration requires oxygen and releases carbon dioxide.
What happens during grooming phase in pyruvate?
Grooming Phase happens when pyruvate itself does not enter the citric acid cycle. A carboxyl group is removed from pyruvate and given off as a molecule of CO2.
How many pyruvates are produced during glycolysis?
GROOMING PHASE. For each molecule of glucose that enters glycolysis, two molecules of pyruvate are produced. These are oxidized, and then two molecules of acetyl CoA enter the citric acid cycle.
What is the mechanism of pyruvate oxidation?
More detailed diagram of the mechanism of pyruvate oxidation. A carboxyl group is removed from pyruvate and released as carbon dioxide. The two-carbon molecule from the first step is oxidized, and NAD+ accepts the electrons to form NADH. The oxidized two-carbon molecule, an acetyl group, is attached to Coenzyme A to form acetyl CoA.
What happens during the grooming phase of the citric acid cycle?
GROOMING PHASE. Grooming Phase happens when pyruvate itself does not enter the citric acid cycle. A carboxyl group is removed from pyruvate and given off as a molecule of CO2. The two carbon compound remaining is oxidized while a molecule of NAD is reduced to NADH ; and a compound called coenzyme A , derived from a B vitamin,…