Photosynthesis vs. Respiration
Explain the relationship between photosynthesis and cellular respiration. Use a diagram if necessary.
Photosynthesis captures and stores energy in glucose, while cellular respiration breaks down glucose to release usable energy (ATP). The products of one process are the reactants of the other.
Where does glycolysis occur?
Cytoplasm
What determines the fate of a pyruvic acid molecule after glycolysis?
Presence or absence of oxygen.
What are the three steps of cellular respiration and how much ATP is gained in each step?
glycolysis 2
krebs cycle 2
ETC 34
Energy ____ while matter _____.
flows, cycles.
What happens during the bridge reaction? Why is this necessary?
What is the name of the substance that joins 2 carbon acetate to form acetyl coa?
Coenzyme A
What is the NET gain of ATP during glycolysis? How do we get to this number?
2 ATP. Initially spend 2 ATP then gain 4 for a net toal of 2.
What is the role of oxygen in cellular respiration?
It is the final electron acceptor at the end of the electron transport chain. It will bond with high energy electrons and a hydrogen and be released as water.
Glycolysis cannot continue forever due to a limited supply of what molecule?
NAD+
Krebs cycle occurs in the _______ of the mitochondria while the electron transport chain occurs in the _____.
matrix, cristae.
Write the chemical formula for cellular respiration. Next, show how each molecule is used/where it goes during the reaction.
Cellular Respiration Chemical Formula:
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP (energy)
glucose is broken down, oxygen is the final electron acceptor, CO2 exits during the krebs cycle, water is released when oxygen binds with high energy electrons and an H.
What are the three components of a molecule of ATP? What bond has to be broken for energy to be released?
The bond between the second and third phosphate groups must be broken to release energy.
What is fermentation? What are the two different types and the products of each?
Fermentation is a process that allows glycolysis to continue when oxygen is unavailable by regenerating NAD+.
As high energy electrons move through the electron transport chain, where are H+ ions pumped? What allows them out of this area via facilitated diffusion?
intermembrane space, ATP synthase.
What is the yield of molecules from one molecule of pyruvic acid going through the krebs cycle?
3 NADH
1 ATP
1 FADH2
2 CO2
What is the overall purpose of glycolysis and the krebs cycle?
The main purpose of glycolysis and the Krebs cycle is to break down glucose and transfer its stored chemical energy to NADH and FADH₂, which deliver high-energy electrons to the electron transport chain where most ATP is produced.
I can complete a drag and drop/FITB diagram for glycolysis, the fate of pyruvic acid, fermentation, and the bridge reaction.
Practice this!
I can complete a drag and drop/FITB diagram for the krebs cycle and the electron transport chain.
Practice this!
What are the total numbers of electron carriers going into the electron transport chain? How many came from each step?
10 NADH (2 from glycolysis, 2 from the bridge reactions and 6 from the Krebs cycle)
2 FADH2 (from the Krebs cycle)
Where do the krebs cycle and ETC take place in prokaryotic cells?
cytoplasm and within special structures of the cell membrane.