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Chapter 9 Cellular Respiration. Section 9-1 Chemical Pathways. Chemical Energy & Food. Energy 1 Gram Glucose = 3811 calories but when is A Calorie Is NOT a calorie. Chemical Energy & Food. calorie ( little c, energy unit ) Is The Energy Needed To Raise 1g of Water

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chapter 9 cellular respiration

Chapter 9Cellular Respiration

Section 9-1

Chemical Pathways

chemical energy food
Chemical Energy & Food

Energy

1 Gram Glucose = 3811 calories

but when is

A Calorie Is NOT a calorie

chemical energy food3
Chemical Energy & Food

calorie(little c, energy unit)

  • Is The Energy Needed To
    • Raise 1g of Water
    • 1 degree Centigrade

Calorie(Capital C)

  • Food Energy Unit
  • Equals 1000 calories
chemical energy food4
Chemical Energy & Food

Cells

  • Don’t BURN Glucose
  • They Gradually Release The Energy Stored In Glucose, Through Cellular Respiration
  • The First Step Is Glycolysis
glycolysis
Glycolysis

Key Concept:

During Glycolysis,

  • Glucose Is Broken In Half
  • To Produce Two Molecules Of

Pyruvic Acid

A Three Carbon Compound

glycolysis cytoplasm
Glycolysis - Cytoplasm

Net Gain =

2 ATP’s

Invest Two ATP’s

To Make Four ATP’s

glycolysis7
Glycolysis

NAD+ …. Accepts 2 Electrons To Form… NADH

NADH = Nicotinamide Adenine Dinucleotide

glycolysis8
Glycolysis

The Purpose of Glycolysis is

The Production of

NADH

Look Familiar?

overview of cellular respiration
Overview of Cellular Respiration

Key Concept:

Cellular Respiration

Is The Process That Releases Energy By Breaking Down Glucose

In The Presence Of Oxygen

overview of cellular respiration10
Overview of Cellular Respiration

Following Glycolysis – The Pyruvic Acids

Have Two Choices

Cellular Respiration

Krebs Cycle

Electron Transport Chain

If Oxygen is Present

If Oxygen is NOT Present

The Pyruvic Acid

Is Moved Into The

Mitochondria Where

The Pyruvic Acid

Stays In The

Cytoplasm Where

Fermentation

Alcoholic

Lactic Acid

slide11

Cellular Respiration

Cytoplasm

Cytoplasm

Glycolysis

Oxygen Present?

No

Yes

Fermentation

Aerobic Respiration

Mitochondria

fermentation
Fermentation

Anaerobic Pathway

No Oxygen

Key Concept:

Two Types Of Fermentation:

  • Alcoholic Fermentation
  • Lactic Acid Fermentation
fermentation13
Fermentation

Why Ferment?

  • Frees Up NAD+
  • Allows Glycolysis To Proceed
    • At least you get 2 more ATP
fermentation14
Fermentation
  • Alcoholic Fermentation
    • Used By Yeasts & Other Microorganisms
    • Used To Make Bread, Beer, etc.
      • CO2 Released As Bubbles
      • Alcohol Bakes Out
fermentation15
Fermentation

Alcoholic Fermentation

Pyruvic Acid + NADH

Alcohol + CO2 + NAD+

fermentation16
Fermentation

Lactic Acid Fermentation

Anaerobic Metabolism Of Animal Cells

Causes Pain & Fatigue

Pyruvic Acid + NADH

Lactic Acid + NAD+

why ferment
Why Ferment?

Net Gain =

2 ATP’s

Fermentation

Because If You Can Ferment

LIVE!

You Get To