Question

Which type of transport requires energy to move a molecule?

Answer 1

Active transport requires energy, often in the form of ATP, to move molecules across a cell membrane against their concentration gradient. It may involve transport proteins and can be either primary or secondary, the latter relying on energy from established electrochemical gradients.

Step-by-step explanation:

Active transport requires energy to move substances across the plasma membrane, particularly when these substances need to move from an area of lower concentration to an area of higher concentration, against their concentration gradient. One of the main sources of energy for active transport is ATP (adenosine triphosphate), which is produced by the cell during cellular respiration. In active transport, molecules might move with the assistance of membrane proteins that function as pumps or through vesicle transport.

Unlike passive transport, which lets substances pass across the membrane without energy because they are moving along the concentration gradient (from higher to lower concentration), active transport does the opposite. It might involve transport proteins, such as carrier proteins, that are embedded in the membrane, or it could use pump mechanisms that require ATP to function.

Answer 2

Active transport

requires energy. This is because it is going against the natural process of diffusion. Substances diffuse when their net movement is down the concentration gradient (from higher concentration to lower). Active transport is movement from lower concentration to higher. Cytosis (phagocytosis , pinocytosis) also requires energy.