Question

Active transport always involves.... (choose 2) no energy molecules move against the concentration gradient molecules move with the concentration gradient energy

Answer 1

Active transport always involves:

1. **Energy** - Active transport requires energy to move molecules against their concentration gradient.
2. **Molecules move against the concentration gradient** - In active transport, substances are transported from an area of lower concentration to an area of higher concentration, which is against the concentration gradient.

So the correct answers are "energy" and "molecules move against the concentration gradient."