Question

1. lactic acid fermentation

o equation: pyruvic acid + nadh → ____________ + nad+

o occurs in ____________ cells during intense exercise

o also used to make __________ and __________

Explanation:

Lactic acid fermentation is a metabolic process. In the equation, pyruvic acid is reduced by NADH. In lactic acid fermentation, pyruvic acid is converted to lactic acid. This process occurs in muscle cells when oxygen is limited (like during intense exercise). Commercially, lactic acid fermentation is used in making yogurt (by Lactobacillus bacteria fermenting lactose to lactic acid which coagulates milk proteins) and sauerkraut (where bacteria ferment sugars in cabbage to lactic acid, preserving it).

Answer:

Lactic acid; muscle; yogurt; sauerkraut