Question

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

Explanation:

Mitochondria are known as the "powerhouses" of the cell. They carry out cellular respiration, a process that breaks down glucose (sugar) in the presence of oxygen. Through a series of chemical reactions (glycolysis, Krebs cycle, and electron transport chain), mitochondria convert the chemical energy stored in glucose into adenosine triphosphate (ATP). ATP is the energy - currency molecule that the cell can use for various functions like active transport, muscle contraction, and biosynthesis.

The rough endoplasmic reticulum is involved in protein synthesis (due to the presence of ribosomes on its surface). The smooth endoplasmic reticulum is mainly for lipid synthesis and detoxification processes. Ribosomes are the sites of protein synthesis, translating the genetic code from mRNA into proteins.

Answer:

mitochondria