Antimycin disrupts ATP production, affecting energy-dependent membrane transport

Steps:

• Antimycin blocks the electron transport chain in mitochondria, halting ATP synthesis.
• Active transport uses ATP to move substances against concentration gradients, so it requires mitochondrial function.
• Facilitated diffusion relies on carrier proteins without energy input, remaining unaffected.
• Endocytosis consumes ATP for membrane invagination and vesicle formation, depending on energy from mitochondria.

Why C is correct:

• Active transport and endocytosis both require ATP (per cellular energy definitions), which antimycin depletes by inhibiting oxidative phosphorylation.

Why the others are wrong:

• A includes facilitated diffusion, a passive process independent of ATP.
• B omits endocytosis, an ATP-dependent bulk transport mechanism.
• D excludes active transport, which directly uses ATP for ion/molecule pumping.

Final answer: C