Question

what is the main purpose of cellular respiration? *
to produce oxygen
to convert glucose into usable energy (atp)
to break down atp
to store energy in glucose

which organelle is the site of aerobic respiration? *
ribosome
nucleus
mitochondrion
chloroplast

Explanation:

Cellular respiration is a metabolic process. Its main goal is to convert glucose (a sugar molecule) into adenosine triphosphate (ATP). ATP is the energy currency of the cell, used for various cellular activities like muscle contraction, active transport, and biosynthesis.

For the second question, mitochondria are known as the "powerhouses" of the cell. Aerobic respiration (which requires oxygen) occurs in mitochondria. Ribosomes are for protein synthesis, the nucleus houses genetic material, and chloroplasts are for photosynthesis (in plants).

Answer:

To convert glucose into usable energy (ATP).
Mitochondrion.