Chemical Pathways & Cellular Respiration Reactions
Chemical Energy and Food
Food serves as a source of ___________
The process that releases energy by breaking down food in the presence of ___________ is
called cellular respiration
Overview of Cellular Respiration
Both plants and animals carry out the final stages of cellular respiration in the _______________
In cellular respiration, energy is gradually released from ___________ and other food molecules
by the process called ______________. This is the first set of reactions in cellular respiration.
Glycolysis - process where ____ molecule of glucose is broken in half, producing ___ molecules
of __________ _________,a 3 carbon compound
ATP Production at the end of glycolysis; gain of _______ ATP
If OXYGEN is present….
1. _________ __________ is broken down and more ATP is produced
NAD+ allows high energy ___________ to be passed from glucose to other
pathways in the cell, creating NADH
B. Electron Transport Chain
1. Electron carriers are converted into _______
***In the Presence of Oxygen, a total of _____ ATP are produced
If NO OXYGEN is present….____________ occurs
Alcoholic Fermentation
Used in the wine and _______ making industry
Lactic Acid Fermentation
Involves a build up of lactic acid in your __________
In fermentation, not as much energy is produced; a total of ___ ATP
Fermentation is an _____________________ process where NADH is able to be converted back
to _________ by passing high energy electrons back to pyruvic acid. This allows a steady supply of
______ to be produced in the absence of __________
Label the following diagram using your textbook ch 9
1. Where does the glucose used in respiration come from?
2. How do you know that this series of reactions occurs in the present of oxygen?
3. What does glycolysis supply to the Krebs cycle?
4. What does glycolysis supply to the electron transport chain?
5. What stages of cellular respiration occur in the mitochondria?
Label the following concept map of cellular respiration pathways using your text
List the following equations:
1. Chemical & written equation for cellular respiration
2. written equation for lactic acid fermentation
3. Written equation for alcoholic fermentation
The Krebs Cycle and Electron Transport
The Krebs Cycle
In the Krebs cycle, ________ ______ is broken down into _____ _________ and is also known
as _________ acid cycle
The krebs cycle begins when the pyruvic acid produced from glycolysis enters the ___________
Carbon Dioxide is formed and ___________ into the atmosphere and _______________ is formed wich
produces a 6 carbon molecule called ________ __________
Everytime you exhale, you release __________ ___________ produced by the ___________ cycle.
The ______ Produced can be used to perform cellular activies
Electron Transport
1. Uses high energy electrons from __________ and _________ in the __________membrane
of the mitochondria in a process called the _______________ transport ___________.
2. at the end of the electron transport chain, oxygen is the final electron acceptor which forms
_________ to get rid of the remaining low energy electrons.
3. In the electron transport chain, ATP synthase molecules spin and form 3 molecules of ______
from every ADP molecule
The Totals
1. Without oxygen – 2 molecules of ATP are formed from glucose (during gylcolysis)
2. With oxygen - ______ TOTAL molecules of ATP are present;
_______ from krebs cycle and electron transport and ____ from glycolysis
Energy and Exercise
*outline the energy stages of a race below
1. Quick Energy
Long-Term Energy
Comparing Photosynthesis and Cellular Respiration
Photosythesis removes __________ from the _______________ and ____________
_______________ puts it back
Organisms involved in cellular respiration
1. All eukaryotes
2. Some prokaryotes
Photosynthesis Only in:
2. Algae
3. Some bacteria