Biology Biochemistry & Metabolism Flashcards
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Read the first 6 Biology Biochemistry & Metabolism flashcards as text
Which molecule serves as the primary energy currency of the cell?
Answer: ATP
ATP (adenosine triphosphate) stores and transfers chemical energy for cellular processes.
Enzymes lower the activation energy of a reaction by:
Answer: Providing an alternative reaction pathway
Enzymes provide an alternative pathway with a lower activation energy, speeding up reactions without being consumed.
Which process converts glucose into pyruvate in the cytoplasm?
Answer: Glycolysis
Glycolysis is the cytoplasmic pathway that breaks down one glucose molecule into two pyruvate molecules, yielding 2 net ATP.
What is the net ATP yield from one glucose molecule during glycolysis?
Answer: 2 ATP
Glycolysis produces 4 ATP but uses 2 ATP as investment, giving a net yield of 2 ATP per glucose.
Anabolic reactions in metabolism are characterized by:
Answer: Building complex molecules from simpler ones
Anabolic reactions consume energy to synthesize complex macromolecules from smaller precursor molecules.
Which coenzyme carries electrons from the Krebs cycle to the electron transport chain?
Answer: NAD+
NAD+ is reduced to NADH in the Krebs cycle, then donates its electrons to Complex I of the electron transport chain.
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