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Cellular Respiration. Glycolysis Krebs cycle Electron transport. Learning check. This figure represents an overview of the different processes of cellular respiration. . Which of the following correctly identifies the different processes?.

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cellular respiration
Cellular Respiration
  • Glycolysis
    • Krebs cycle
      • Electron transport
learning check
Learning check

This figure represents an overview of the different processes of cellular respiration.

Which of the following correctly identifies the different processes?

  • 1. Glycolysis; 2. Electron transport chain; 3. Krebs cycle
  • 1. Glycolysis; 2. Krebs cycle; 3. Electron transport chain
  • 1. Krebs cycle; 2. Electron transport chain; 3. Glycolysis
  • 1. Electron transport chain; 2. Glycolysis; 3. Krebs cycle
slide3

What would happen to the flow of electrons if oxygen were not present?

The flow of electrons would continue but at a slower rate.

The flow would cease and ATP production would stop.

The presence of oxygen would have no effect.

slide4

Cyanide binds strongly with the last electron carrier in the chain.

How would this affect the flow of electrons?

The flow of electrons would continue but at a slower rate.

The flow would cease and ATP production would stop.

The presence of cyanide would have no effect.

cell respiration overview
Cell Respiration Overview

Glucose:

Stores energy in the molecule

Cell respiration:

  • Breaks down the molecules
  • Extracts the contained energy
  • Transfers electrons (from glucose)
  • To hydrogen carriers (e.g., NADH)
  • And to make ATP
  • Giving off waste products (CO2 & H2O)

1st stage:

2nd & 3rd stage:

Cytoplasm

Mitochondria

slide7

1st stage:

2nd stage:

3rd stage:

Glycolysis

Krebs cycle (or citric acid)

Electron transport

glycolysis in the cytoplasm
Glycolysis, in the cytoplasm

Series of steps (but 2 phases)

Glucose

2 pyruvic acid molecules

1.

As bonds in glucose are broken

Electrons (and H+ ions)

NAD+

2.

NADH

Glucose

Is oxidized

NAD+

Is reduced

Net output is 2 ATP for each glucose molecule

But, most of the released energy carried by NADH

glucose 2 pyruvic acids
Glucose 2 pyruvic acids

Phase one

3 carbon

6 carbon

3 carbon

glycolysis phase 1
Glycolysis, phase 1

Some ATP is used to start the ‘breakdown’ of glucose

Mitochondria

Cytoplasm

View Activity: Glycolysis

slide11

Glycolysis, phase 2

High energy electrons are donated

To NAD+

Forming NADH

slide12

Glycolysis, phase 2

And, phosphate groups are transferred

ATP is made

in between glycolysis krebs
In-between glycolysis & Krebs

Just before (or as) they enter the mitochondria

Pyruvic acid molecules are modified

And CO2 is released

The altered molecule is acetic acid

(…vinegar!)

Acetic acid is attached to a carrier molecule

Called coenzyme A

And forms acetyl CoA

To the mitochondrion

learning check14
Learning check

7

3

4

2

6

8

1

5

  • Name of molecule
  • What does the arrow refer to?
  • Name of molecule
  • Name of molecule
  • Where does this take place?
  • Name molecule
  • Name molecule
  • Name molecule
  • Name the reaction
krebs cycle in the mitochondria
Krebs cycle, in the mitochondria

Series of reactions

Continues to break down the sugar

Present as acetic acid

Captures more energy

As NADH & FADH2

And more CO2 is released

Net output is 2 ATP for each glucose molecule

But again, most of the released energy carried by NADH

slide16

Krebs (citric acid) cycle & energy production

Citric acid

Waste:

2 CO2

Fuel:

Acetic acid

3

3

Acceptor molecule

View Activity: The Citric Acid Cycle

electron transport in the mitochondria
Electron Transport, in the mitochondria

Most of the ATP is produced in the ET

And, NADH & FADH donate their electrons to the ET

At the end of the chain of steps

O2 exerts a strong pull on electrons

And combines electrons & H+ ions to form H2O

The ‘downhill’ flow of electrons powers an enzyme

ATP synthase

Which produces ~ 34 ATP

electron transport
Electron Transport

An array of molecules

(…proteins)

In the inner membrane of the mitochondrion

View Activity: Electron Transport

slide19

Electrons move from one member to the next

The energy given up pumps H+ to inner space

Matrix

Oxygen captures electrons

Hydrogens are added, water forms

slide20

The buildup of H+ ions give up energy

When they diffuse through a special protein

ATP synthase

Matrix

ATP synthase captures their energy

To make ATP

learning check name the numbered parts
Learning check, name the numbered parts

15

10

How many?

4

7

11

1

6

9

14

2

3

12

8

16

17

13

5

18

learning check22
Learning check
  • Of the 3 stages of cell respiration, which produces the most ATP per glucose?
  • In glycolysis, _______ is oxidized and _______ is reduced.
  • The final electron acceptor of the electron transport chains in mitochondria is _______.
learning check23
Learning check
  • Cells can harvest the most chemical energy from which of the following?
  • An NADH molecule
  • A glucose molecule
  • Six carbon dioxide molecules
  • Two pyruvic acid molecules