Question

which organelles work together to transform the energy of organic compounds into a suitable form for immediate use by the cell?
a. mitochondria and chloroplast
b. ribosome and mitochondria
c. nucleus and chloroplast
d. lysosome and vacuole

Explanation:

To solve this, we analyze each option:

• Option A: Mitochondria convert organic compound energy (like glucose) into ATP (usable energy). Chloroplasts are for photosynthesis (converting light to chemical energy in plants), but the question is about using organic compound energy. However, in plant cells, both can be involved in energy transformations (chloroplasts make organic compounds, mitochondria use them). But let's check others.
• Option B: Ribosomes make proteins, not energy transformation. Mitochondria do energy, but ribosomes don't help here. Eliminate B.
• Option C: Nucleus is for genetic control, chloroplasts for photosynthesis (making organic compounds, not using them for immediate energy in the way the question asks? Wait, maybe a typo? If it's "nucleus and chloroplast" – nucleus isn't for energy. But maybe the original option was miswritten? Wait, the question is about transforming organic compound energy to usable form. Mitochondria do that (cellular respiration). Chloroplasts in plants make organic compounds (photosynthesis) which are then used by mitochondria. So maybe A is correct? Wait, no – the question is "transform the energy of organic compounds into a suitable form for immediate use". Mitochondria do that (break down organic compounds to ATP). Chloroplasts make organic compounds (from light), not use them. Wait, maybe the option is mislabeled? Or maybe in plant cells, chloroplasts produce the organic compounds (like glucose) which are then used by mitochondria to make ATP. So together, they work in the energy flow (chloroplasts make the organic compounds, mitochondria use them for energy). Let's check other options:
• Option D: Lysosomes digest, vacuoles store – neither for energy transformation.

So the best answer is A (mitochondria and chloroplasts), as chloroplasts produce the organic compounds (like glucose) which mitochondria then convert to ATP (usable energy).

Answer:

A. mitochondria and chloroplast