Question

energy from the cell is needed to move substances against a concentration difference. compare and contrast what are the similarities and differences between facilitated diffusion and active transport by a protein pump? protein pumps energy from atp is used to pump small molecules and ions across the cell membrane. active transport proteins change shape during the process, binding substances on one side of the membrane, and releasing them on the other. endocytosis the membrane forms a pocket around a particle. the pocket then breaks loose from the cell membrane and forms a vesicle within the cytoplasm. exocytosis the membrane of a vesicle surrounds the material then fuses with the cell membrane. the contents are forced out of the cell. cytoplasm

Explanation:

Both facilitated diffusion and active transport by a protein pump involve the use of transport - proteins in the cell membrane to move substances across the membrane. However, facilitated diffusion is a passive process that moves substances down their concentration gradient (from high to low concentration) without the use of energy (ATP). In contrast, active transport by a protein pump moves substances against their concentration gradient (from low to high concentration) and requires energy from ATP.

Answer:

Similarities: Both use transport - proteins in the cell membrane to move substances across the membrane.
Differences: Facilitated diffusion is passive, moves substances down the concentration gradient and doesn't require energy. Active transport by a protein pump is active, moves substances against the concentration gradient and requires ATP energy.