Question

select the part whose main job is to break down sugar and release energy that the cell can use.
mitochondria
vacuole
smooth endoplasmic reticulum
chloroplast

Explanation:

To solve this, we analyze each cell part:

• Mitochondria: Known as the "powerhouse of the cell," it breaks down sugar (like glucose) through cellular respiration to release energy (ATP) for the cell.
• Vacuole: Mainly stores substances (water, nutrients, waste) in the cell, not energy production.
• Smooth Endoplasmic Reticulum: Involved in lipid synthesis and detoxification, not sugar breakdown for energy.
• Chloroplast: Found in plant cells, converts light energy to chemical energy (photosynthesis), not breaking down sugar for energy (that's respiration, done by mitochondria).

So the correct part is mitochondria.

Answer:

A. mitochondria