Question

why are mitochondria sometimes called the powerhouse of cells? mitochondria are not called the powerhouse of cells. they are the site of photosynthesis. they are the site of cellular respiration.

Explanation:

To determine why mitochondria are called the powerhouse of cells, we analyze each option:

• The first option is incorrect as mitochondria are commonly known as the powerhouse.
• The second option is wrong because photosynthesis occurs in chloroplasts, not mitochondria.
• The third option is correct because cellular respiration (which produces ATP, the cell’s energy currency) takes place in mitochondria.

Answer:

The option "They are the site of cellular respiration." (the third option in the list)