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HHB 1.7 2025
Glossary flashcards
25
Biology
Not Applicable
05/08/2025

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Term
glycolysis
Definition
first stage in cellular respiration
Term
glucose
Definition
sugar that is broken down into pyruvate
Term
pyruvate
Definition
Breakdown product of sugar; broken down into an acetyl group
Term
phosphorylation
Definition
addition of phosphate group from ATP
Term
ADP
Definition
adenosine diphosphate; molecule that is phosphorylated to produce ATP
Term
ATP
Definition
adenosine triphosphate; molecule used for energy transfer in cells
Term
energy investment phase
Definition
uses two ATP molecules for the phosphorylation of glucose and intermediates in glycolysis
Term
energy pay-off phase
Definition
produces four ATP molecules in glycolysis
Term
dehydrogenases
Definition
enzymes that remove hydrogen ions and electrons from their substances and pass them onto NAD; important in glycolysis and the citric acid cycle
Term
NAD
Definition
coenzyme that combines with hydrogen ions and electrons released in glycolysis and citric acid cycle and transports them to the electron transport chain
Term
acetyl group
Definition
produced by breakdown of pyruvate; joins with oxaloacetate to form citrate in the citric acid cycle
Term
coenzyme A
Definition
substance that carries acetyl groups to the citric acid cycle
Term
citric acid cycle
Definition
second stage of aerobic respiration occurring in the matrix of mitochondria
Term
mitochondria
Definition
cell organelle in which the aerobic stages of respiration occurs
Term
matrix
Definition
central cavity of a mitochondrion; location of the citric acid cycle occurs
Term
oxaloacetate
Definition
substance that combines with the acetyl group in the citric acid cycle to form citrate
Term
citrate
Definition
formed when oxaloacetate combines with the acetyl group in the citric acid cycle
Term
carbon dioxide
Definition
released as a waste product from citric acid cycle
Term
inner membrane of mitochondria
Definition
location of the electron transport chain
Term
electron transport chain
Definition
group of proteins embedded in the inner membrane of mitochondria; final stage of cellular respiration
Term
electrons
Definition
particles that yield energy as they pass through an electron transport chain
Term
hydrogen ions
Definition
pumped across the inner membrane of the mitochondria, then flow back through ATP synthase
Term
ATP synthase
Definition
membrane bound enzyme that synthesises ATP when hydrogen ions flow through it, down their concentration gradient
Term
oxygen
Definition
combines with hydrogen ions and electrons to make water
Term
DNA replication, protein synthesis, muscle contraction, nerve impulse transmission
Definition
cellular processes which require energy
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