The correct sequence of anaerobic reactions in yeast is

Options

A. Glucose `overset("cytoplasm")rarr` Pyruvate `overset("mitochondria")rarr` Ethanol + Carbon dioxide
B. Glucose `overset("cytoplasm")rarr` Pyruvate `overset("cytoplasm")rarr` Lactic acid
C. Glucose `overset("cytoplasm")rarr` Pyruvate `overset("mitochondria")rarr` Lactic acid
D. Glucose `overset("cytoplasm")rarr` Pyruvate `overset("cytoplasm")rarr` Ethanol + Carbon dioxide

Answer

D

Explanation

Yeast is an unicellular eukaryote which carries out ethanol fermentation. In the first phase, glucose is converted into pyruvate (glycolysis) in the cytoplasm of the cell. Due to limited oxygen availability, pyruvate remains in cytoplasm where pyruvate decarboxylase and alcohol dehydrogenase enzymes carry out the second phase of anaerobic respiration and produce ethanol and carbon dioxide.