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Compare lactic acid fermentation and alcoholic fermentation by describing what pyruvic acid is changed in to. Be sure to include what type of organism each one takes place in.
• State the balanced chemical equation for anaerobic respiration in the microorganism yeast as C6H12O6 → 2C2H5OH + 2CO2 • State that lactic acid builds up in muscles and blood during vigorous exercise causing an oxygen debt • Outline how the oxygen debt is removed during recovery, limited to:
Explain why lactic acid was produced by the cytoplasm fraction incubated with glucose, but not the mitochondrial fraction. The cytoplasm is the site of glycolysis, which occurs in the presence of glucose.
Anaerobic respiration in humans may be summarised by the word equation: glucose lactic acid + energy In yeast anaerobic respiration may be summarised by: glucose ethanol + carbon dioxide + energy During glycolysis, glucose molecules (six-carbon molecules) are split into two pyruvates (three-carbon
This equation can also be shown as a balanced chemical equation. One molecule of glucose is broken down into two molecules of lactic acid
The body can deal with lactic acid in one of two ways. It can be oxidised (reacted with oxygen) to form carbon dioxide and water – the same products formed in aerobic respiration. Alternatively, blood flowing through the muscles transports the lactic acid to the liver where it is converted back into glucose
dioxide and energy, as shown in the word equation below: glucose + oxygen energy + water + carbon dioxide Or the balanced symbol equation C 6 H 12 O 6 + 6O 2 energy + 6H 2 O + 6CO 2 Anaerobic respiration occurs in the absence of oxygen. In mammalian muscles the glucose is broken down to lactic acid. glucose energy + lactic acid
