Question

2 some molecules require the cell to use energy for movement across the membrane. this is called ______.
active transport
hydrophilic
passive transport
hydrophobic

Explanation:

• Active transport requires energy (usually ATP) to move molecules against their concentration gradient (from low to high concentration).
• Hydrophilic means water - loving, referring to a molecule's property, not a transport mechanism.
• Passive transport does not require energy as molecules move down their concentration gradient (from high to low concentration).
• Hydrophobic means water - fearing, also a property of a molecule, not a transport process.

Answer:

A. active transport