KREBS CYCLE &

ELECTRON TRANSPORTChapter 9-2

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REMEMBER:The “fork in the road” happens following glycolysis. The presence or absence of _______________decides which path it takes next.

Flowchart

Section 9-2

Glucose(C6H1206)

+Oxygen

(02)

Glycolysis

Cellular Respiration

We will next focus on the Krebs Cycle. This is the path that is taken when oxygen is present.

Image from BIOLOGY Miller and Levine; Prentice Hall Publishing

_______________ follows glycolysis if oxygen is

present

KREBS CYCLE

REMEMBER:

Glycolysis happens inthe ________________outside the mitochondria.

Krebs cycle happens in_____________inside the mitochondria

_______________ (also called pyruvate)enters the _________________

Pyruvic acid joinswith _______________to form ________________

Diagram by Riedell

WHERE DO THESE GO?

Carbon dioxide is released into the ________________

High energy electron carriers move into the

____________________

(We will come back to this later)

Krebs Cycle Animation-(select #2)

Citric Acid Formation:

2 carbon ACETYL-COA combines with a 4 carbon molecule to form a 6-carbon molecule called _______________ .

WHERE DO THESE GO?

Coenzyme A goes back to pick up another ________________

Citric acid completes the ____________

KREBS CYCLE PRODUCES

____

____

____

____

KREBS CYCLE

Krebs Cycle Animation-(select #3)

WHERE DOES IT GO?

6 carbons in original glucose are lost as ________________ to atmosphere

→

WHERE DO THESE GO?

ATP can be used directlyto supply __________ for the cell.

High energy electron carriers move into the

____________________

Flowchart

Section 9-2

Glucose(C6H1206)

+Oxygen

(02)

GlycolysisKrebsCycle

Cellular Respiration

We will next focus on the the Electron Transport Chain

WHERE DOES IT HAPPEN?

Enzymes for ELECTRON TRANSPORT CHAINare located in the ___________________________

ELECTRON TRANSPORT CHAIN

Image from: BIOLOGY by Miller and Levine; Prentice Hall Publishing©2006

INTERMEMBRANE SPACE

MATRIX

CRISTAE

Electron Transport Chain Animation-(select start, continue, and #1)

Electron Transport Chain:

High-energy _____________ from __________ and __________are passed along the electron transport chain.

Energy from passing electrons is used to transport _____________________ across the membrane.

The pumping of H+ ions into the _______________________ represents potential energy that is harnessed to make ATP.As H+ ions escape through ion channels back into the matrix, ________________ spins and adds a phosphate to ADP toform _______

Electron Transport Chain Animation-(select start, continue, and #3)

Electron Transport Chain:

Electron Transport Chain:

________________ serves as the final electron acceptor of the electron transport chain.

At the end of the electron transport chain, an enzyme combines the electrons with the hydrogen ions and oxygen to form ______________

High-energy electrons from ________ come inat beginning but electrons from _________come in farther down the chain.

Electron Transport Chain Animation-(#1 and #2)

SO:

NADH → _____FADH2 → _____

Glucose Glycolysis

Cytoplasm

Pyruvic acid

Electrons carried in NADH

Krebs Cycle

Electrons carried in

NADH and FADH2

Electron Transport

Chain

Mitochondrion

Figure 9–2 Cellular Respiration: An Overview

WHATS THE BIG PICTURE?

CELLULAR RESPIRATIONincludes:

______________________

______________________

_______________________

GLYCOLYSISHappens in ______________

Breaks down ____________into ________________

Produces

_______ __________

KREBS CYCLEhappens in ________________

Breaks down _________________

Produces: ____ ____

____ ____

ELECTRON TRANSPORT

Enzymes found in _____________

Uses high energy electrons and H+ ionsdonated by _______ and _______

Makes ___________

________ acts a final electron acceptor to produce ________

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CELLULAR RESPIRATION(aerobic/ with oxygen):

1 glucose → _______________

FERMENTATION(anaerobic/ without oxygen):

1 glucose → ________________

CARBOHYDRATES SUPPLY ENERGY

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Cells burn GLUCOSE for their energy needs

Remember !

EXERCISE and ENERGY(Short term energy)

Cells normally contain _________amounts of ATP produced by_______________ &__________________________(only enough for a few seconds of activity)

Once this ATP is used up_____________ fermentation can provide enough ATPto last about ___________________.

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EXERCISE and ENERGY(Short term energy)

Once race is over, _______________must be broken down using oxygen.

A quick sprint builds up an ________________ thatmust be repaid by______________________

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EXERCISE and ENERGY(LONGER term energy)

For exercise longer than 90 seconds_____________________ is the onlyway to make enough ATP.

Cellular respiration releases energy_____________ than fermentation.

Well conditioned athletes must pace themselves during a long race.

Animal cells store GLUCOSE as_____________to use later.

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REMEMBER

What happens in a long race when the body’s glucose all is used up?

EXERCISE and ENERGY(LONGER term energy)

________________ store glucose as ________________ which can be broken down into glucose to supply energy for_______________of activity.

EXERCISE and ENERGY(LONGER term energy)

After glycogen stores are used up the body

begins to break down ________

That’s why aerobic exercise

must continue for longer than

20 minutes if you want tolose weight!

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ALL CELLS NEED ENERGY

All __________________(including plant and animal cells) have _______________ for cellular respiration

All __________________ (bacteria)have their electron transport enzymes attached to their_____________________

Remember: No membrane bound organelles!