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Krebs cycle is also known as _________.
TCA
C3
C4
CAM
TCA
The Krebs cycle is known as the Tricarboxylic Acid (TCA) cycle because the first stable product formed in the cycle is Citrate, which is a tricarboxylic acid. It serves as the second major stage of aerobic cellular respiration, occurring in the mitochondrial matrix.
The Krebs cycle is known as the Tricarboxylic Acid (TCA) cycle because the first stable product formed in the cycle is Citrate, which is a tricarboxylic acid. It serves as the second major stage of aerobic cellular respiration, occurring in the mitochondrial matrix.
Think of the Krebs cycle as a central recycling station in a factory where raw material (Acetyl-CoA) is fed into a circular assembly line to generate high-value energy currency (ATP) for the cell.
Citrate Is Krebs' Special Substrate For Making Oxaloacetate (Citrate, Isocitrate, Ketoglutarate, Succinyl-CoA, Succinate, Fumarate, Malate, Oxaloacetate).
Acetyl-CoA+3NAD++FAD+GDP+PiтАЛ+2H2тАЛOтЖТ2CO2тАЛ+3NADH+3H++FADH2тАЛ+GTP+CoA-SH
The cycle begins when acetyl-CoA (2C) combines with oxaloacetate (4C) to form citrate (6C). Through a series of redox, decarboxylation, and phosphorylation reactions, the citrate is oxidized back into oxaloacetate. This process releases CO2тАЛ and generates energy-carrying molecules like NADH, FADH2тАЛ, and ATP (or GTP).
It is also known as the Citric Acid Cycle.
Occurs in the mitochondrial matrix of eukaryotic cells.
It is an amphibolic pathway, serving both catabolic and anabolic roles.
The net yield per one glucose molecule (two turns) is 2ATP, 6NADH, and 2FADH2тАЛ.
Highly efficient energy extraction from carbohydrates, fats, and proteins.
Provides precursors for the biosynthesis of amino acids and fatty acids.
Requires the presence of oxygen indirectly through the Electron Transport Chain to regenerate NAD+ and FAD.
Cellular respiration in aerobic organisms.
Metabolic intermediate production for biosynthetic pathways.
Named after Hans Krebs, who discovered the cycle in 1937.
Option B (C3), C (C4), and D (CAM) refer to distinct pathways of carbon fixation in photosynthesis, not cellular respiration.
A is correct тАФ The Krebs cycle is widely referred to as the TCA cycle due to the three carboxylic acid groups found in its primary intermediate, citrate.
Do not confuse the TCA cycle (catabolic/respiration) with the Calvin Cycle (anabolic/photosynthesis); keep these distinct to avoid common errors in exam questions.
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