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).
