Question

certain seaweeds contain a greater concentration of iodine inside their cells than there is in the seawater surrounding them. the energy required to maintain this concentration difference is most closely associated with the action of

1. ribosomes
2. mitochondria
3. vacuoles
4. nuclei

Explanation:

• Ribosomes are involved in protein synthesis.
• Mitochondria are the power - houses of the cell and produce ATP (energy). Maintaining a concentration gradient (like of iodine against the concentration in seawater) requires active transport which needs energy (ATP).
• Vacuoles are mainly for storage (of water, nutrients, waste etc.).
• Nuclei contain the genetic material.

Answer:

1. mitochondria