Cellular Respiration
Cellular Respiration
• Who? All eukaryotic cells• Purpose? Convert food (such as glucose) into ATP• 1 glucose = 36 ATP• Aerobic process: reaction requires O2
• Exothermic reaction: reaction that releases heat
Glucose
C6H12O6
Step 1: Glycolysis
• Where? In the cell’s cytoplasm• What happens?
A) Glucose (from our food) is broken down
B) 2 ATP molecules released for cellular processes
C) Broken pieces of glucose (pyruvate) enter mitochondrion
C
CCATPATP
Mitochondrion
En-zyme
C
CC
C
CC
Step 2: Kreb’s Cycle
• Where? The matrix (fluid enclosed by inner membrane) • What happens?
A) Enzymes break apart the glucose fragments
B) 2 ATP & CO2 created
C) Energy molecules sent to inner mitochondrion membrane
Mitochondrion
C
CC
C
CC
En-zyme
En-zyme
CO2
CO2
CO2
CO2
CO2
CO2
ATP
ATP
Energy molecule
ATP
ATP
Mitochondrion
Step 3: Electron Transport Chain
• Where? Inner mitochondrion membrane• What happens?
A) Mitochondrion takes in oxygen (aerobic)
B) Enzymes + Energy molecule + O2
bonds ADP + P to create…. Up to 34 ATP molecules
C) O2 bonds with H left over from energy molecule
– H2O created as waste
O2
ATP
Energy molecule
En-zyme
P ADPATP
ATP
ATPATPATP
ADP
O2
P
P
O2
O2
O2
ADP
ADPPATP
ATP
H2O H2OH2OH2O
Review1) Which molecule is the energy molecule of cells?
2) Which types of organisms perform cellular respiration?
3) Where does glycolysis occur?
4) What is broken down during glycolysis?
5) What is created as a result of glycolysis?
6) Where is aerobic respiration performed?
7) Name the 2 stages of respiration that take place in the mitochondria.
8) Which waste gas is created by the Kreb’s cycle?
9) What molecule is created as a waste by the “ETC”?
10) How many ATP molecules are made during glycolysis?
11) How many ATP molecules are made during Kreb’s cycle?
12) How many ATP molecules are made during “ETC”?
13) How many ATP molecules are made in total?
Review Answers 1) Which molecule is the energy molecule of cells?
2) Which types of organisms perform cellular respiration?
3) Where does glycolysis occur?
4) What is broken down during glycolysis?
5) What is created as a result of glycolysis?
6) Where is aerobic respiration performed?
7) Name the 2 stages of respiration that take place in the mitochondria.
8) Which waste gas is created by the Kreb’s cycle?
9) What molecule is created as a waste by the “ETC”?
10) How many ATP molecules are made during glycolysis?
11) How many ATP molecules are made during Kreb’s cycle?
12) How many ATP molecules are made during Electron transport chain?
13) How many ATP molecules are made in total?
ATP
Eukaryotes
Cell’s cytoplasm
Glucose
2 ATP and 2 3-carbon molecules (pyruvate)
Mitochondria
CO2
2 ATP
2 ATP
Up to 34 ATP molecules
Up to 38 ATP molecules
The Kreb’s Cycle & The Electron Transport Chain
H2O
14)