ATP (Adenosine Triphosphate) is the primary energy currency of cells. It powers various cellular processes by transferring a phosphate group to another molecule, a process called phosphorylation. This transfer energizes the target molecule, allowing it to perform its work.

Ways ATP powers cellular work:

* Muscle contraction: ATP provides energy for the sliding of protein filaments within muscle cells.

* Active transport: ATP powers pumps that move molecules against their concentration gradient across cell membranes.

* Cellular signaling: ATP is involved in signaling pathways within the cell, often by activating proteins.

* Biosynthesis: ATP provides energy for building complex molecules like proteins, carbohydrates, and lipids.

What's NOT a way ATP powers cellular work?

The answer is it does NOT directly provide energy for cellular respiration.

* Cellular respiration is the process that generates ATP by breaking down glucose. ATP is the product of respiration, not the fuel that drives it.

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