Download Chapter 6: Cell Energy: Photosynthesis and Respiration

Chapter 6: Cell Energy: Photosynthesis and Respiration
Section 3: Glycolysis and Respiration
Glycolysis – Breaking Down Glucose
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__________________________________________________________________
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Gives off 3811 ___________________________
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Glycolysis takes place in the ________________________________ of a cell
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In glycolysis, a series of enzymes catalyzes chemical reactions that change
____________________________, one step at a time, into __________________
_____________________________
Respiration
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If oxygen is available, _______________________________ can take place
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________________________ process

Respiration is the process that involves ___________________________ and
breaks down ____________________________________________ to release
______________________
o Uses the ___________________________________ formed in glycolysis
o Often used as a synonym for ________________________________
o Takes place in the cell’s ____________________________________
The Krebs Cycle
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First set of reactions in respiration
o __________________________________
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2 carbon atoms added (from the breakdown of pyruvic acid)
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2 carbon atoms removed (in 2 molecules of CO2)
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3 molecules of NAD+ converted to NADH
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1 molecule of FAD converted to FADH2
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1 molecule of GDP converted to GTP
Electron Transport in the Mitochondrion
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High energy electrons from NADH and FADH2 are passed to electron transport
enzymes in the mitochondrion
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Form an ________________ along which electrons are passed
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Enzyme at the end of the chain combines e- from ETC, H+ ions from fluid inside
the cell, and O2 to form ______________________

_____________________________ is the final electron acceptor in respiration
o Is essential for obtaining energy from both NADH and FADH2
ATP Formation
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Electron transport involves the movement of _____________________________

As enzymes accept electrons, they pump a hydrogen from the inside to the outside
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This movement powers the formation of __________________
o On average, the movement of a pair of electrons down the ETC produces
enough energy to form ___________________ from ADP
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More ____________________________________
o This imbalance supplies the energy to make _______________ from ADP
The Totals
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Glycolysis and respiration together produce a total of ______________________
molecules
Obtaining Energy From Food
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________________________________________________________ are broken
down into simple sugars that are then converted into glucose
o The pathways we have discussed can be used to produce energy
o The cell can generate chemical energy in the form of ATP from just about
any source
Breathing and Respiration
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Final acceptor for all electrons in respiration is ________________________
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Without oxygen, electron transport cannot operate, Krebs cycle stops, and ATP
production stops
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With each breath we take, air flows into our lungs
o ___________________________ has a critical role to play in the
mitochondria of every cell
Energy in Balance
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________________________________ and ___________________________
can be thought of as opposite processes
o Photosynthesis ___________________________________________
o Respiration ______________________________________________