Notes 7.2 – Aerobic and Anaerobic

RespirationCell Respiration Part 2

Page 131

Standards

CLE 3210.3.3 Investigate the relationship between the processes of photosynthesis and cellular respiration.SPI 3210.3.3 Compare and contrast photosynthesis and cellular respiration in terms of energy transformation.

Objectives

Identify the reactants and products of the Krebs CycleEvaluate situations when a cell must use anaerobic vs. aerobic respirationIdentify the reactants and products of the Electron Transport ChainSummarize the major events in aerobic and anaerobic respiration

Find a Partner

With your Partner:Review Glycolysis:

Reactants:

Products:

Location:

Glucose, 2 ATP and NAD+

Pyruvate , H2O, 4 ATP, and NADH

Cytosol

Review: What happens to Pyruvate?Two possible paths:

Pyruvate

Aerobic Respiration

(mitochondria)

Fermentation (cytosol)

Lots of ATP

Few ATP

Overview of Aerobic Respiration

Two Main Parts: Krebs Cycle (citric acid cycle) – uses pyruvateElectron Transport Chain – uses NADH

Krebs Cycle – (citric acid cycle)

Reactants:

Products:

Pyruvate (pyruvic acid)

ATP – goes into cytosolCO2 – is releasedNADH2 – Goes to ETC (electron transport chain)

Electron Transport Chain (ETC)

Reactants:

Products:

NADH2 ; FADH2 oxygen

34 ATP molecules2 molecules H2O

With your Partner

Which reaction provides the greatest net gain of ATP?

Energy Gain

With your Partner

Even though plant cells make some ATP during photosynthesis why do they need cell respiration as well?

What happens when cells are without oxygen?

Fermentation (Anaerobic Respiration)

With your Partner

Brainstorm some situations when a cell could be devoid of Oxygen

Fermentation (anaerobic)

Two types of fermentation:Lactic Acid fermentation:

Alcohol fermentation:

ATP Yield = 2

Performed by human muscle cells and some microorganisms - used to make cheeses, yogurt, sour cream.

Performed by some microorganisms – used to make ethyl alcohol.

With your Partner:

Determine what all of these have in common.

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