Question

Do the following processes require energy when transporting molecules across the cell membrane?(c) active transport

Accepted Answer

Understand the concept of active transport: Active transport is a process where molecules are moved across the cell membrane against their concentration gradient (from a region of lower concentration to a region of higher concentration). This movement is not spontaneous and requires energy input. Identify the energy source: Active transport typically requires energy in the form of adenosine triphosphate (ATP). ATP provides the necessary energy to drive the transport proteins that facilitate this movement. Recognize the role of transport proteins: Active transport involves specific proteins, such as pumps (e.g., the sodium-potassium pump), which use the energy from ATP to change their shape and move molecules across the membrane. Compare with passive transport: Unlike passive transport (e.g., diffusion or facilitated diffusion), which does not require energy and moves molecules along their concentration gradient, active transport requires energy because it works against the natural gradient. Conclude that energy is required: Based on the definition and mechanism of active transport, it is clear that this process requires energy to move molecules across the cell membrane against their concentration gradient.

Do the following processes require energy when transporting molecules across the cell membrane?
(c) active transport

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