Do plants undergo the process of cellular respiration? Possible Answers: Some plants do, but only when being eaten by herbivores . Yes, but only at night.
What is the citric acid cycle in photosynthesis?
The citric acid cycle is a series of chemical reactions that removes high-energy electrons and uses them in the electron transport chain to generate ATP . One molecule of ATP (or an equivalent) is produced per each turn of the cycle.
Who does the citric acid cycle take place?
The TCA cycle, also known as the citric acid cycle or Krebs cycle, occurs in the mitochondria and provides large amounts of energy in aerobic conditions by donating electrons to three NADH and one FADH (flavin adenine dinucleotide), which donate electrons to the electron transport chain, creating the proton gradient ...
What is TCA cycle and where does it occur?
Where does the Krebs cycle take place? The TCA cycle was first observed in the muscle tissue of a pigeon. It takes place in all eukaryotic and prokaryotic cells. In eukaryotes, it occurs in the matrix of the mitochondrion. In prokaryotes, it takes place in the cytosol.
Why citric acid cycle is called TCA cycle?
Citric acid is a so-called tricarboxylic acid, containing three carboxyl groups (COOH) . Hence the Krebs cycle is sometimes referred to as the tricarboxylic acid (TCA) cycle.
Why is the citric acid cycle called a cycle?
The citric acid cycle is called a cycle because the starting molecule, oxaloacetate (which has 4 carbons), is regenerated at the end of the cycle .
What is the role of the citric acid cycle?
The citric acid cycle is the final common oxidative pathway for carbohydrates, fats and amino acids. It is the most important metabolic pathway for the energy supply to the body . TCA is the most important central pathway connecting almost all the individual metabolic pathways.
Is water produced in the citric acid cycle?
The two main products that result from the breakdown of glucose are carbon dioxide and water. Carbon dioxide is produced during pyruvate dehydrogenase and the Krebs cycle. Water is formed at the end of the electron transport chain where two electrons (hydrogens) are added to oxygen (the final electron acceptor).
What is the function of the citric acid cycle?
The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid cycle, is at the center of cellular metabolism, playing a starring role in both the process of energy production and biosynthesis . It finishes the sugar-breaking job started in glycolysis and fuels the production of ATP in the process.
What are the steps of citric acid cycle?
- Oxidative Decarboxylation of pyruvate to Acetyl CoA.
- Step 1: Condensation of acetyl CoA with oxaloacetate.
- Step 2: Isomerization of citrate into isocitrate.
- Step 3: Oxidative decarboxylations of isocitrate.
- Step 4: Oxidative decarboxylation of α-ketoglutarate.
Is the citric acid cycle reductive?
The reverse Krebs cycle (also known as the reverse tricarboxylic acid cycle, the reverse TCA cycle, or the reverse citric acid cycle, or the reductive tricarboxylic acid cycle, or the reductive TCA cycle) is a sequence of chemical reactions that are used by some bacteria to produce carbon compounds from carbon dioxide ...
Is citric acid cycle aerobic or anaerobic?
Like aerobic respiration, anaerobic respiration involves glycolysis, a transition reaction, the citric acid cycle, and an electron transport chain.
What are the key features of the citric acid cycle?
Key Points
The eight steps of the citric acid cycle are a series of redox, dehydration, hydration, and decarboxylation reactions . Each turn of the cycle forms one GTP or ATP as well as three NADH molecules and one FADH2 molecule, which will be used in further steps of cellular respiration to produce ATP for the cell.
What is citric acid cycle also known as?
Krebs cycle The Krebs cycle, also known as the citric acid cycle or the tricarboxylic acid cycle, is one of the most important reaction sequences in biochemistry.
How is the citric acid cycle regulated?
TCA cycle is regulated by allosteric regulation . The metabolites regulate the cycle by feedback inhibition. The enzyme isocitrate dehydrogenase and ⍺-ketoglutarate dehydrogenase are the main controlling point. ATP and NADH inhibit the enzymes isocitrate dehydrogenase and ⍺-ketoglutarate dehydrogenase.
What are the reactants in the citric acid cycle?
The Citric Acid Cycle reactants include pyruvic acid, oxaloacetic acid, succinic acid, fumarate and malate . In the first stage, pyruvic acid is oxidized into a molecule called acetyl-coenzyme A.
What occurs in the first step of the citric acid cycle?
The citric acid cycle utilizes mitochondrial enzymes. The first step is fusion of the acetyl group of acetyl-CoA with oxaloacetate, catalyzed by citrate synthase . CoA-SH and heat are released and citrate is produced. Citrate is isomerized by dehydration and rehydration to isocitrate.
Which of the following is not produced by or an intermediate of the citric acid cycle?
Lactic acid is never a part of citric acid cycle. Acetyl Co A, citric acid and succinic acid are part of citric acid cycle. Lactic acid is produced in anaerobic respiration in muscles. Thus, the correct answer is option D.
