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Cellular Respiration Cellular Respiration: metabolic
reactions that convert stored chemical energy into usable chemical energy (ATP).
Where? inside cells of organisms
Two Major Types Aerobic Respiration- oxygen (electron
acceptor) is required to generate ATP Anaerobic Respiration- talk about this later.
Food is ingested
Food is modified- broken down
Fermentation• Lactate• Ethanol + CO2
i. Kreb’s Cycleii. Electron Transport
Chain
Is Oxygen Present to accept electrons?
YES! NO!Aerobic Respiration
Anaerobic Respiration
Cellular
Respiration
Food is ingested
Food is modified- broken down into
monomers
Fermentation• Lactate• Ethanol + CO2
i. Kreb’s Cycleii. Electron Transport
Chain
Is Oxygen Present to accept electrons?
YES! NO!Aerobic Respiration
Anaerobic Respiration
Cellular
Respiration
Stage 1 of Cellular Respiration
Most Common Example: Glycolysis
Glycolysis: breaking down of glucose
Glucose pyruvate + ATP
Pyruvate = 3 Carbon sugar
O2
Steps of Glycolysis 1. Phosphates from two ATP molecules are
transferred to a single glucose molecule to make a 6- C- PP compound (takes three reactions)
2. The 6-C-PP compound is broken down into two 3- C- P compounds (takes two reactions)
3. Another phosphate is is added to the two 3- C- P compounds to make two 3- C- PP compounds
4. Each 3- C- PP compound is converted into pyruvate, producing four 3-C pyruvates (takes four reactions)
Food is ingested
Food is modified- broken down
Fermentation• Lactate• Ethanol + CO2
i. Kreb’s Cycleii. Electron Transport
Chain
Is Oxygen Present to accept electrons?
YES! NO!Aerobic Respiration
Anaerobic Respiration
Cellular
Respiration
Inner Compartme
nt Electron Transport Chain
Inside of Cell
Aerobic Respiration Summary
Goal: To make lots of ATP = usable chemical energy for the cell
Krebs Cycle
Uses pyruvate to free electrons
Electron Carriers: NADH, FADH2
Electron Transport Chain
Electrons used to create a H+ gradient to leave via ATP synthase to make ATP.
Pre- Krebs Cycle Pyruvate enters a mitochondrion and is
converted into a 2-C compound
By product is a 2-C acetyl molecule (different 2-C compound)
Acetyl binds to a molecule called coenzyme A (CoA) to make acetyl-CoA.
Krebs Cycle1. Acetyl-CoA binds to a 4-C compound, to make a
6-C compound and releases coenzyme A
2. CO2 is released from 6-C compound, to make a 5-C compound. Electrons are transferred to NAD+, to make NADH
3. CO2 is released from the 5-C compound, to make a 4-C compound. ATP is made and NADH are made
4. 4-C compound is converted into a different 4-C compound. Electrons are transferred to FAD, to make FADH2
5. New 4-C compound is converted to original 4-C compound to continue cycle. NADH is made.
Electron Transport Chain1. Electrons from electron carriers NADH and
FADH2 pass through the ETC located in the inner mitochondria membrane
2. Energy from the electrons is used to pump H+ ions outside the inner mitochondria compartment
3. Since there is a higher concentration of H+ ions outside, they are transported back inside through carrier protein ATP Synthase
4. ATP Synthase uses the H+ ion gradient to combine ADP & P to make ATP
5. The used electrons and H+ ions bind with oxygen to form water.
Aerobic Respiration Movie
Topic- Glycolysis, Krebs Cycle, ETC
Tools- camera, large dry erase board and dry erase markers.
Rubric- max 5 pts each
Accuracy
Easy to See/ Hear
Intriguing/ Creative
Vincent and Gavin
Gaby and Kira
Luke and Alivia
Claire and Grant
Alvaro and Thomas
Andrew and Maddie
Shruti and Dominic