Does active transport require energy according to the material?

Does active transport require energy according to the material?

• A. Yes
• B. No
• C. Sometimes
• D. Not specified

Answer: (A)

Active transport requires energy because it moves substances across a membrane against their gradient, which is an uphill process. To do this, cells use energy stored in ATP to power pumps that change shape and push ions or molecules across the membrane, such as the Na+/K+-ATPase. In secondary active transport, energy isn’t used directly at the moment of transport, but the process relies on an ion gradient that was itself created by an ATP-driven pump. This means energy is still involved somewhere in the system. Examples like glucose uptake with a sodium gradient or proton pumps in various membranes illustrate how energy input enables transport that wouldn’t happen if the substances were simply diffusing. So, according to the material, active transport requires energy.

Active transport requires energy because it moves substances across a membrane against their gradient, which is an uphill process. To do this, cells use energy stored in ATP to power pumps that change shape and push ions or molecules across the membrane, such as the Na+/K+-ATPase. In secondary active transport, energy isn’t used directly at the moment of transport, but the process relies on an ion gradient that was itself created by an ATP-driven pump. This means energy is still involved somewhere in the system. Examples like glucose uptake with a sodium gradient or proton pumps in various membranes illustrate how energy input enables transport that wouldn’t happen if the substances were simply diffusing. So, according to the material, active transport requires energy.