Question

Choose the correct answers from the alternatives given :
The first process in breaking down glucose is

• A. the Krebs cycle
• B. glycolysis
• C. electron transport system
• D. fermentation

Answer 1

The correct option is B glycolysis

The process of breaking down of glucose is cellular respiration. It has three steps :

1. Glycolysis
2. Krebs cycle
3. Terminal oxidation

Glycolysis is the first basic step where oxygen is not required, it takes place in the cytoplasm of the cell. In this process glucose molecule is broken down into two molecules of pyruvate by the series of enzymatic reaction to obtain energy which is followed by Krebs cycle and then electron transport system while fermentation is anaerobic respiration, it does not require oxygen.

So, the correct option is ' glycolysis'.