Metabolic Pathways
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Stevek113
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BIOCHEMISTRY
Metabolic Pathways
Acetyl-CoA
Acetyl-CoA acts as a metabolic crossroads linking fuel sources and biosynthesis
12 hours ago
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Why is acetyl-CoA considered a central molecule in metabolism?
Because it integrates carbohydrate, lipid, and protein metabolism by delivering acetyl groups to the citric acid cycle and serving as a precursor for biosynthesis
Because it only stores energy without participating in other metabolic pathways
Because it can freely cross mitochondrial membranes to transport energy
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Brewster
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BIOCHEMISTRY
Metabolic Pathways
Glycolysis
Glycolysis powers life by turning sugar into energy without oxygen
43 hours ago
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What is the primary trade-off in the glycolysis reaction pathway?
Initial ATP investment is required to activate glucose before net ATP gain
Glycolysis produces oxygen as a byproduct to generate energy
Glycolysis only occurs in the presence of oxygen
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Stevek113
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BIOCHEMISTRY
Metabolic Pathways
Citric Acid Cycle
Ancient metabolic crossroads where energy and biosynthesis collide in living cells
4 days ago
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How does the citric acid cycle balance its dual roles in energy production and biosynthesis?
By only focusing on ATP production and ignoring biosynthesis during high energy demand.
By regulating the flow of metabolites to either produce ATP or supply precursors for amino acids depending on cellular needs.
By following a fixed, unchanging pathway that always produces the same outputs regardless of conditions.
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Steeeve
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BIOCHEMISTRY
Metabolic Pathways
Fatty Acid Synthesis
Cellular factories build fats from scratch using a complex enzyme assembly line
10 days ago
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What is the primary role of NADPH in fatty acid synthesis?
It acts as a substrate that directly adds carbon atoms to the growing fatty acid chain.
It serves as an energy source by donating phosphate groups to activate enzymes.
It provides the reducing power needed for the reduction steps during chain elongation.
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BIOCHEMISTRY
Metabolic Pathways
Acetyl-CoA
Acetyl-CoA's dual role fuels energy production and molecular building in a metabolic balancing act
13 days ago
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What determines whether acetyl-CoA is used for energy production or biosynthesis in the body?
The amount of oxygen available in the bloodstream
The body's current metabolic state, such as fasting or nutrient abundance
The presence of acetyl-CoA exclusively in muscle cells
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Steeeve
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BIOCHEMISTRY
Metabolic Pathways
Citric Acid Cycle
The citric acid cycle’s flexibility reveals life’s ancient metabolic adaptability
7 Feb 2026
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What is the primary role of the citric acid cycle in cellular metabolism?
To directly produce glucose from fatty acids
To function only in the presence of oxygen without any alternative pathways
To oxidize acetyl-CoA and produce energy-rich molecules like ATP and NADH
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Bonbo
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BIOLOGY
Biochemistry
Metabolic Pathways
Metabolic pathways orchestrate life’s chemistry through enzyme-driven molecular transformations
26 Jan 2026
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Why is the product of one enzyme typically the substrate for the next enzyme in a metabolic pathway?
Because it allows for a controlled and efficient sequence of chemical reactions within the cell.
Because enzymes randomly interact with any molecule available in the cell.
Because the cell does not regulate the order of chemical reactions in metabolic pathways.
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