Question Video: Defining the term 'Photophosphorylation' | Nagwa Question Video: Defining the term 'Photophosphorylation' | Nagwa

Question Video: Defining the term 'Photophosphorylation' Biology • Second Year of Secondary School

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What is the creation of ATP from the phosphorylation of ADP using light energy known as? [A] Dephosphorylation [B] Oxidative phosphorylation [C] Photophosphorylation [D] Chemiosmosis

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Video Transcript

What is the creation of ATP from the phosphorylation of ADP using light energy known as? (A) Dephosphorylation, (B) oxidative phosphorylation, (C) photophosphorylation, (D) chemiosmosis.

To help us answer this question, let’s break down the reactions being described. Phosphorylation refers to the addition of a phosphate group. When ADP is phosphorylated, it forms the energy-carrying molecule ATP. In the light-dependent stage of photosynthesis, this phosphorylation of ADP is catalyzed by the enzyme ATP synthase. This process will only happen when light is available. This is actually where we get the photo- part of photosynthesis from. Photo- means light and synthesis means to make. So, we can assume from this that reactions which require light energy will typically have the word part photo- present.

Looking back at our answers, we can see that one option summarizes the process of phosphorylating a molecule using light energy. Therefore, the creation of ATP from the phosphorylation of ADP using light energy is known as photophosphorylation, or answer choice (C).

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