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)