Question

21) At the start of glycolysis, the electrons are (high /low) energy and are found in ___________ molecules. These
electrons (gain/lose) energy as they are transferred to ___________. __________ carries these (high/low) energy
electrons to the mitochondria where they are sent through the electron transport chain and end up on
_________________ molecules. By the end, these electrons are (high /low) energy.

22) At the start of glycolysis, glucose (gains/loses) energy when 2 ATP are _________. After this, ____ (#) ATP are
produced in glycolysis, making the net ATP production ___ (#) ATP. Later, ____ (#) ATP molecules are made in
pyruvate oxidation and ____ are made in the TCA cycle. ~30 ATP molecules are made as the result of
________________ where the electrochemical gradient powers the enzyme _______________.

Answer 1

ANSWER :

21) At the start of glycolysis, the electrons are low energy and are found in orgnic (e.g.- glucose) molecules. These
electrons gain energy as they are transferred to electron carriers (e.g.- NAD+). NADH carries these high energy
electrons to the mitochondria where they are sent through the electron transport chain and end up on
O2 molecules (terminal acceptor). By the end, these electrons are low energy.

22)  At the start of glycolysis, glucose losses energy when 2 ATP are consumed. After this, 4 ATP are
produced in glycolysis, making the net ATP production 2 ATP. Later, 2 ATP molecules are made in
pyruvate oxidation and 2 are made in the TCA cycle. ~30 ATP molecules are made as the result of
oxidative phosphorylation where the electrochemical gradient powers the enzyme ATP synthase.