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What type of energy is used to move or transport molecules across a cell membrane?

  1. Thermal

  2. Light

  3. Mechanical

  4. Electrical

The correct answer is: Electrical

The process of actively moving molecules across a cell membrane requires the use of energy. While thermal energy, light energy, and mechanical energy can all be involved in cellular processes, they are not directly used to move molecules across the membrane. Only electrical energy can be used to actively transport molecules across the membrane, making option D the correct answer. Thermal energy may be involved in passive transport processes such as diffusion, but is not used for active transport. Light and mechanical energy may be involved in photosynthesis and muscle movement, respectively, but not in the transportation of molecules across the cell membrane.