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Priestley lit a candle.

He then placed a glass jar over it…

…and watched as the flame gradually died out.

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Priestley lit a candle.

He then placed a glass jar over it…

…and watched as the flame gradually died out.

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Priestley reasoned that something in the air was necessary to keep the flame burning.

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Priestley then placed

fresh mint leaves

underneath the jar

and allowed the

entire setup to sit for

a few days.

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A few days passed…

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After a few days,

Priestley found that

he could relight the

candle and it would

burn for a while.

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After a few days,

Priestley found that

he could relight the

candle and it would

burn for a while.

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Priestley concluded that the plant had produced the substance required for burning.

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What substance was consumed as the candle burned the first time?

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What must have been added to the jar to enable the candle to burn the second time?

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Where did this oxygen come from?

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What do you think would happen if Priestley had put the plant and candle back in the jar for a few days then once again tried to light the candle?

  1. the plant would die
  2. the plant would light on fire
  3. the candle would light again
  4. the candle would not light again

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Suppose Priestley had put the plant and jar into a dark closet for a few days. Do you think the candle would have lit again?

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What does this tell you about plants and oxygen?

  1. plants do not need oxygen
  2. plants produce oxygen all the time
  3. plants produce as much oxygen as they need
  4. plants produce oxygen in the presence of light

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In another experiment,

Priestley put a mouse

under the jar and

waited to see what

would happen.

We will find out later what happens

Seriously? I have

to wait

till later to get

out of the jar

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In another experiment,

Priestley put a mouse

under the jar and waited to see what would happen.

Sadly, the mouse eventually died.

I waited for this?!

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Later, Priestley put a mouse under the jar with fresh mint leaves and waited to see what would happen.

To his surprise, both the mouse and plant survived for quite some time.

Minty fresh breath

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What important substance was produced by the plant?

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Cellular Respiration

Objectives:

  • Summarize how glucose is broken down in the first stage of cellular respiration.
  • Describe how ATP is made in the second stage of cellular respiration.
  • Identify the role of fermentation in the second stage of cellular respiration.
  • Evaluate the importance of oxygen in aerobic respiration.

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Cellular Respiration Takes place in the cytoplasm and mitochondria

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Mitochondria

  • The matrix where carbohydrates are broken down to (CO2 and water)
  • The cristae is where ATP is made

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Cellular Respiration

  • A series of reactions where fats, proteins, and carbohydrates, mostly glucose, are broken down to make CO2, water, and energy (ATP).

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Vocabulary

  • Cellular Respiration – the transfer of energy from glucose into ATP

​

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Cellular Respiration

  • Cellular Respiration is a metabolic process like burning fuel
    • Releases much of the energy in food to make ATP
    • This ATP provides cells with the energy they need to carry out the activities of life.
    • C6H12O6 + 6O2 6CO2 + 6H2O + ATP

​

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Cellular Respiration

Cellular Energy

  • Cellular respiration has two stages.
  • Glycolysis The first stage of cellular respiration makes ~ 4 ATP No Oxygen Needed

​

  • Aerobic and Anaerobic Respiration The second stage of cellular respiration is either aerobic respiration or anaerobic respiration.
    • A large amount of ATP is made during aerobic respiration. NAD+ is recycled during the anaerobic process of fermentation.

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Cellular Respiration

Stage One: Breakdown of Glucose

  • Glycolysis Glucose is broken down to pyruvate during glycolysis, making ~4 ATP.

​

  • No Oxygen used

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Anaerobic Respiration

  • Takes place without O2
  • Takes place in cytoplasm of cell
  • Makes 2 ATP

​

  • Glycolysis + Anaerobic cellular respiration = 6 ATP

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Aerobic Respiration

  • Requires O2
  • Takes place in the mitochondria of cell
  • Makes 34-36 ATP

​

  • Glycolysis + Aerobic cellular respiration = ~38 ATP

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Active Transport

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Pumping H+ ions from low concentration to high

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Electron Transport Chain

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Review

  • When oxygen is present most the ATP made in cellular respiration is produced by:

A. aerobic respiration

B. Glycolysis

C. alcoholic fermentation

D. Lactic acid fermentation.