The energy currency of the cell is
ATP
The correct option is B.
Explanation of the correct option :
1. Adenosine triphosphate (ATP) is an organic compound that provides energy for many metabolic activities in an organism.
2. ATP is formed as the result of cellular respiration, and this energy is used for many activities. Hence it is known as the energy currency of the cell.
Explanation of the incorrect options :
Option A:
Mitochondria provide the site for cellular respiration, and thus it is known as the powerhouse of the cell.
Option C :
1. Flavin adenine dinucleotide( FAD) is a coenzyme that is associated with many proteins of several enzymatic reactions.
2. It indirectly maintains hemoglobin in its reduced functional state and also protect erythrocyte from getting damaged.
Option D :
Glucose is a type of sugar and a major source of energy for the cells.
Final answer: The energy currency of the cell is ATP.