In prokaryotic cells, such as bacteria, which lack mitochondria, the citric acid cycle reaction sequence is performed
in the cytosol
with the proton gradient for ATP production being across the cell’s surface (plasma membrane) rather than the inner membrane of the mitochondrion.
Where does the citric acid cycle occur in prokaryotes?
The citric acid cycle, also known as the Kreb’s cycle, occurs within the mitochondria of eukaryotic cells. In prokaryotic cells, it occurs in
the cytosol
.
Where does citric acid cycle occur?
Within the mitochondrion, the citric acid cycle occurs in
the mitochondrial matrix
, and oxidative metabolism occurs at the internal folded mitochondrial membranes (cristae).
What is the importance of 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?
Step 1: Acetyl CoA (two carbon molecule) joins with oxaloacetate (4 carbon molecule) to form citrate (6 carbon molecule). Step 2:
Citrate is converted to isocitrate
(an isomer of citrate) Step 3: Isocitrate is oxidised to alpha-ketoglutarate (a five carbon molecule) which results in the release of carbon dioxide.
What are the two main benefits of the citric acid cycle?
The two main purposes of the citric acid cycle are: A) synthesis of citrate and gluconeogenesis. B)
degradation of acetyl-CoA to produce energy and to supply precursors for anabolism
.
Why is it called citric acid cycle?
It is called citric acid cycle
because the citric acid is both the first product and the final reactant of this metabolic pathway
. It involves eight step processes in which the Acetyl Coenzyme A is converted to Citrate, Isocitrate, α-ketoglutarate, succinyl-CoA, succinate, fumarate, malate, and oxaloacetate.
What happens if the citric acid cycle stops?
it will either
slow down ATP production
or not be able to function causing a negative feedback reaction that will tell the cell to make more ATP. the pathway of an electron through the electron transport chain.
What is the main function of the Kreb cycle?
The main function of the Krebs cycle is
to produce energy
, stored and transported as ATP or GTP. The cycle is also central to other biosynthetic reactions where the intermediates produced are required to make other molecules, such as amino acids, nucleotide bases and cholesterol.
What is the most important function of the citric acid cycle quizlet?
The function of the citric acid cycle is
to harvest high-energy electrons from carbon fuels
.
What is the main purpose of the citric acid cycle quizlet?
What is the main purpose of the citric acid cycle?
To oxidize carbons in intermediates to CO2 and generate high-energy electron carriers (NADH and FADH2) and GTP
. The citric acid cycle begins with acetyl CoA.
What are the 10 steps in glycolysis?
- Step 1: Hexokinase. …
- Step 2: Phosphoglucose Isomerase. …
- Step 3: Phosphofructokinase. …
- Step 4: Aldolase. …
- Step 5: Triosephosphate isomerase. …
- Step 6: Glyceraldehyde-3-phosphate Dehydrogenase. …
- Step 7: Phosphoglycerate Kinase. …
- Step 8: Phosphoglycerate Mutase.
How many ATP does citric acid cycle produce?
| Step ATP | Glycolysis 6 | Citric Acid Cycle w/ 2 pyruvic acid 2 x 15 = 30 ATP | Net complete glucose 36 ATP |
|---|
How many ATP are used in citric acid cycle?
The citric acid cycle also produces
2 ATP
by substrate phosphorylation and plays an important role in the flow of carbon through the cell by supplying precursor metabolites for various biosynthetic pathways.
What occurs in the first step of the citric acid cycle?
Steps in the Citric Acid Cycle. Step 1. The first step is
a condensation step
, combining the two-carbon acetyl group (from acetyl CoA) with a four-carbon oxaloacetate molecule to form a six-carbon molecule of citrate.
What is the end goal of the citric acid cycle?
Throughout the citric acid cycle, oxaloacetate is progressively transformed into several different molecules (as carbon atoms are added to and removed from it), but at the end of the cycle
it always turns back into oxaloacetate to be used again
.
