Respiration Flashcards
What is the respiration word equation?
Glucose + oxygen —-> CO2 + H2O
What is the symbol equation for respiration?
C6H12O6 + 6O2 —-> 6CO2 + 6H2O
Why is respiration important?
All living things respire
Form ATP from the breakdown of glucose
Cells use ATP as immediate energy source
What are the two types of respiration?
Anaerobic
Aerobic
What are coenzymes?
Complex organic molecules that are used by enzymes to accept or donate molecules in a reaction
What is respiration?
A series of reactions in which energy is transferred from organic compounds, such as carbohydrates to the temporary energy store, ATP
What are the four stages of respiration?
Glycolysis
Link Reaction
Krebs cycle
Oxidative phosphorylation
Where does glycolysis happen?
Cytoplasm of mitochondria
Where does LR happen?
Matrix of mitochondria
Where does krebs happen?
Matrix of mitochondria
Where does OP happen?
Cristae of mitochondria
Describe glycolysis
Activation of glucose by phosphorylation
Splitting phosphorylated glucose into 2X TP
Oxidation of TP = H removed from each TP then H transferred to NAD+ to form rNAD
Production of ATP = enzymes convert 3C TP to 3C pyruvate
2X ATP generated from ADP (net)
Why is 2X Pi added to glucose (in activation of glucose by phosphorylation in glycolysis)?
More reactive by adding 2X Pi
Provides energy to activate glucose + lower AE needed for following enzyme controlled reaction
Where does the 2X Pi come from in glycolysis?
Hydrolysis of ATP = 2X ATP spent
What is the total yield of glycolysis?
2X ATP - small but fast (used to phosphorylate glucose)
2X rNAD
2X pyruvate
Because respiration is carried out by all living things what does it provide evidence for?
Common ancestry
What does the link reaction do?
Link glycolysis to krebs
Why does the link reaction occur twice for every glucose molecule?
For each glucose molecule in glycolysis 2X pyruvate made
LR uses 1 pyruvate molecule so krebs can happen = 2x for every glucose molecule
What is the overall equation for 1 link reaction?
Pyruvate + NAD + CoA —-> Acetyl CoA + rNAD + CO2
What happens in the link reaction?
Pyruvate (3C) decarboxylated to form CO2
Remaining 2C product (acetate) combines with coenzyme A to form acetyl CoA
Oxidation reaction occurs where NAD collects H atoms = forms rNAD
What is not produced in the link reaction?
ATP
Where does acetyl CoA go from link reaction?
Krebs